# Get child, of child, of child etc
**URL:** https://discuss.elastic.co/t/get-child-of-child-of-child-etc/102113
**Category:** Elasticsearch
**Created:** [September 28, 2017, 12:24pm UTC](https://discuss.elastic.co/t/get-child-of-child-of-child-etc/102113 "2017-09-28T12:24:08Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@emillykkejensen](https://discuss.elastic.co/u/emillykkejensen)
#### Post date: [September 28, 2017, 12:24pm UTC](https://discuss.elastic.co/t/get-child-of-child-of-child-etc/102113/1 "2017-09-28T12:24:08Z")
Postet this question on stackoverflow as well, but hoping to get better answers here.
I am trying to get all children and all parents of a doc id, where one child can be the parent, grandparent, grand grandparent etc. of multiple docs.
So let's say I have a structur like this (borrowed from [https://www.elastic.co/guide/en/elasticsearch/reference/5.6/parent-join.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.6/parent-join.html)):
```
(parent)
question
/ \
/ \
comment answer
(child) (child)
```
In code:
```
PUT my_index
{
"settings": {
"mapping.single_type": true
},
"mappings": {
"doc": {
"properties": {
"my_join_field": {
"type": "join",
"relations": {
"question": ["answer", "comment"]
}
}
}
}
}
}
```
However, one can answer comments and comment answers theoretically forever. So say I have a question, that is structured like this:
```
(id: 1)
question
/ \
/ \
answer answer
(id: 5) (id: 8)
/ \ |
/ \ |
comment answer answer
(id: 15) (id: 12) (id: 9)
/ \ | / \
/ \ | / \
answer answer comment answer answer
(id: 16)(id: 17) (id: 19) (id: 10)(id: 11)
```
How do I get all the documents (ids 1, 5, 8, 9, 10, 11, 12, 15, 16, 17, 19), only knowing id 9?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [October 26, 2017, 12:24pm UTC](https://discuss.elastic.co/t/get-child-of-child-of-child-etc/102113/2 "2017-10-26T12:24:53Z")
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