diff --git a/docs/field-details.asciidoc b/docs/field-details.asciidoc
index e8034c4b5c..fff6f56423 100644
--- a/docs/field-details.asciidoc
+++ b/docs/field-details.asciidoc
@@ -1967,7 +1967,7 @@ type: keyword
 
 ==== Field Reuse
 
-The `hash` fields are expected to be nested at: `file.hash`, `process.hash`.
+The `hash` fields are expected to be nested at: `file.hash`, `process.hash`, `process.parent.hash`.
 
 Note also that the `hash` fields are not expected to be used directly at the top level.
 
diff --git a/generated/beats/fields.ecs.yml b/generated/beats/fields.ecs.yml
index 09e80d5d47..928af80de5 100644
--- a/generated/beats/fields.ecs.yml
+++ b/generated/beats/fields.ecs.yml
@@ -2465,6 +2465,26 @@
         The field should be absent if there is no exit code for the event (e.g. process
         start).'
       example: 137
+    - name: parent.hash.md5
+      level: extended
+      type: keyword
+      ignore_above: 1024
+      description: MD5 hash.
+    - name: parent.hash.sha1
+      level: extended
+      type: keyword
+      ignore_above: 1024
+      description: SHA1 hash.
+    - name: parent.hash.sha256
+      level: extended
+      type: keyword
+      ignore_above: 1024
+      description: SHA256 hash.
+    - name: parent.hash.sha512
+      level: extended
+      type: keyword
+      ignore_above: 1024
+      description: SHA512 hash.
     - name: parent.name
       level: extended
       type: keyword
diff --git a/generated/csv/fields.csv b/generated/csv/fields.csv
index b698234b8c..dc86ea2210 100644
--- a/generated/csv/fields.csv
+++ b/generated/csv/fields.csv
@@ -318,6 +318,10 @@ ECS_Version,Indexed,Field_Set,Field,Type,Level,Example,Description
 1.4.0-dev,true,process,process.parent.executable,keyword,extended,/usr/bin/ssh,Absolute path to the process executable.
 1.4.0-dev,true,process,process.parent.executable.text,text,extended,/usr/bin/ssh,Absolute path to the process executable.
 1.4.0-dev,true,process,process.parent.exit_code,long,extended,137,The exit code of the process.
+1.4.0-dev,true,process,process.parent.hash.md5,keyword,extended,,MD5 hash.
+1.4.0-dev,true,process,process.parent.hash.sha1,keyword,extended,,SHA1 hash.
+1.4.0-dev,true,process,process.parent.hash.sha256,keyword,extended,,SHA256 hash.
+1.4.0-dev,true,process,process.parent.hash.sha512,keyword,extended,,SHA512 hash.
 1.4.0-dev,true,process,process.parent.name,keyword,extended,ssh,Process name.
 1.4.0-dev,true,process,process.parent.name.text,text,extended,ssh,Process name.
 1.4.0-dev,true,process,process.parent.pgid,long,extended,,Identifier of the group of processes the process belongs to.
diff --git a/generated/ecs/ecs_flat.yml b/generated/ecs/ecs_flat.yml
index 5216b4029e..7538268550 100644
--- a/generated/ecs/ecs_flat.yml
+++ b/generated/ecs/ecs_flat.yml
@@ -4040,6 +4040,50 @@ process.parent.exit_code:
   order: 29
   short: The exit code of the process.
   type: long
+process.parent.hash.md5:
+  dashed_name: hash-md5
+  description: MD5 hash.
+  flat_name: process.parent.hash.md5
+  ignore_above: 1024
+  level: extended
+  name: md5
+  order: 0
+  original_fieldset: hash
+  short: MD5 hash.
+  type: keyword
+process.parent.hash.sha1:
+  dashed_name: hash-sha1
+  description: SHA1 hash.
+  flat_name: process.parent.hash.sha1
+  ignore_above: 1024
+  level: extended
+  name: sha1
+  order: 1
+  original_fieldset: hash
+  short: SHA1 hash.
+  type: keyword
+process.parent.hash.sha256:
+  dashed_name: hash-sha256
+  description: SHA256 hash.
+  flat_name: process.parent.hash.sha256
+  ignore_above: 1024
+  level: extended
+  name: sha256
+  order: 2
+  original_fieldset: hash
+  short: SHA256 hash.
+  type: keyword
+process.parent.hash.sha512:
+  dashed_name: hash-sha512
+  description: SHA512 hash.
+  flat_name: process.parent.hash.sha512
+  ignore_above: 1024
+  level: extended
+  name: sha512
+  order: 3
+  original_fieldset: hash
+  short: SHA512 hash.
+  type: keyword
 process.parent.name:
   dashed_name: process-parent-name
   description: 'Process name.
diff --git a/generated/ecs/ecs_nested.yml b/generated/ecs/ecs_nested.yml
index 10bc0b8708..58bef2ac07 100644
--- a/generated/ecs/ecs_nested.yml
+++ b/generated/ecs/ecs_nested.yml
@@ -2698,6 +2698,7 @@ hash:
     expected:
     - file
     - process
+    - process.parent
     top_level: false
   short: Hashes, usually file hashes.
   title: Hash
@@ -4438,6 +4439,50 @@ process:
       order: 29
       short: The exit code of the process.
       type: long
+    parent.hash.md5:
+      dashed_name: hash-md5
+      description: MD5 hash.
+      flat_name: process.parent.hash.md5
+      ignore_above: 1024
+      level: extended
+      name: md5
+      order: 0
+      original_fieldset: hash
+      short: MD5 hash.
+      type: keyword
+    parent.hash.sha1:
+      dashed_name: hash-sha1
+      description: SHA1 hash.
+      flat_name: process.parent.hash.sha1
+      ignore_above: 1024
+      level: extended
+      name: sha1
+      order: 1
+      original_fieldset: hash
+      short: SHA1 hash.
+      type: keyword
+    parent.hash.sha256:
+      dashed_name: hash-sha256
+      description: SHA256 hash.
+      flat_name: process.parent.hash.sha256
+      ignore_above: 1024
+      level: extended
+      name: sha256
+      order: 2
+      original_fieldset: hash
+      short: SHA256 hash.
+      type: keyword
+    parent.hash.sha512:
+      dashed_name: hash-sha512
+      description: SHA512 hash.
+      flat_name: process.parent.hash.sha512
+      ignore_above: 1024
+      level: extended
+      name: sha512
+      order: 3
+      original_fieldset: hash
+      short: SHA512 hash.
+      type: keyword
     parent.name:
       dashed_name: process-parent-name
       description: 'Process name.
diff --git a/generated/elasticsearch/6/template.json b/generated/elasticsearch/6/template.json
index 93628ac71a..750c01fdb9 100644
--- a/generated/elasticsearch/6/template.json
+++ b/generated/elasticsearch/6/template.json
@@ -1518,6 +1518,26 @@
                 "exit_code": {
                   "type": "long"
                 }, 
+                "hash": {
+                  "properties": {
+                    "md5": {
+                      "ignore_above": 1024, 
+                      "type": "keyword"
+                    }, 
+                    "sha1": {
+                      "ignore_above": 1024, 
+                      "type": "keyword"
+                    }, 
+                    "sha256": {
+                      "ignore_above": 1024, 
+                      "type": "keyword"
+                    }, 
+                    "sha512": {
+                      "ignore_above": 1024, 
+                      "type": "keyword"
+                    }
+                  }
+                }, 
                 "name": {
                   "fields": {
                     "text": {
diff --git a/generated/elasticsearch/7/template.json b/generated/elasticsearch/7/template.json
index 053d9ae09e..ae8b1a3636 100644
--- a/generated/elasticsearch/7/template.json
+++ b/generated/elasticsearch/7/template.json
@@ -1517,6 +1517,26 @@
               "exit_code": {
                 "type": "long"
               }, 
+              "hash": {
+                "properties": {
+                  "md5": {
+                    "ignore_above": 1024, 
+                    "type": "keyword"
+                  }, 
+                  "sha1": {
+                    "ignore_above": 1024, 
+                    "type": "keyword"
+                  }, 
+                  "sha256": {
+                    "ignore_above": 1024, 
+                    "type": "keyword"
+                  }, 
+                  "sha512": {
+                    "ignore_above": 1024, 
+                    "type": "keyword"
+                  }
+                }
+              }, 
               "name": {
                 "fields": {
                   "text": {
diff --git a/schemas/hash.yml b/schemas/hash.yml
index 7a3f815613..1c6f21c131 100644
--- a/schemas/hash.yml
+++ b/schemas/hash.yml
@@ -16,6 +16,7 @@
     expected:
       - file
       - process
+      - process.parent
 
   fields:
 
diff --git a/scripts/schema_reader.py b/scripts/schema_reader.py
index 2d1e84be93..bc4170bff3 100644
--- a/scripts/schema_reader.py
+++ b/scripts/schema_reader.py
@@ -130,11 +130,14 @@ def duplicate_reusable_fieldsets(schema, fields_flat, fields_nested):
     if 'reusable' in schema:
         for new_nesting in schema['reusable']['expected']:
 
+            split_flat_name = new_nesting.split('.', 1)
+            top_level = split_flat_name[0]
             # List field set names expected under another field set.
             # E.g. host.nestings = [ 'geo', 'os', 'user' ]
-            if 'nestings' not in fields_nested[new_nesting]:
-                fields_nested[new_nesting]['nestings'] = []
-            fields_nested[new_nesting]['nestings'].append(schema['name'])
+            if 'nestings' not in fields_nested[top_level]:
+                fields_nested[top_level]['nestings'] = []
+            if schema['name'] not in fields_nested[top_level]['nestings']:
+                fields_nested[top_level]['nestings'].append(schema['name'])
 
             # Explicitly list all leaf fields coming from field set reuse.
             for (name, field) in schema['fields'].items():
@@ -150,7 +153,13 @@ def duplicate_reusable_fieldsets(schema, fields_flat, fields_nested):
                 fields_flat[destination_name] = copied_field
 
                 # Nested: use original flat name under the destination fieldset
-                fields_nested[new_nesting]['fields'][field['flat_name']] = copied_field
+                # If the nesting is being inserted anywhere except the top level, combine the flat name
+                # of the destination location with the flat name of the field to be inserted
+                if len(split_flat_name) == 1:
+                    new_flat_name = field['flat_name']
+                else:
+                    new_flat_name = split_flat_name[1] + "." + field['flat_name']
+                fields_nested[top_level]['fields'][new_flat_name] = copied_field
 
 # Main