How can I return all parents of a vertex in arango ql?

I'm trying to write an AQL query that returns all children of a vertex and that vertex itself.

For example I have this structure:

  A      B         C
  |      |         |
  D------          E     F

This is how my query looks:

for parent in collection
for child in outbound parent link
   RETURN{ parent, 
       child
    }

But it returns the results in the form

"child": D
"parent": A

"child": D
"parent":B

"child": E
"parent": C

The result I'm expecting from the query is like

"child": D
"parent": A, B

"child": E
"parent": C

"child": F
"parent":

How can I amend my query to get the result?

Solution

After some messing about, I ended up creating a query suitable for my needs.

FOR child in entity
     LET parents = (
            FOR p IN INBOUND child link
            RETURN {parentfp: p.fingerprint, parentTypeFp: p.typeFp})
            RETURN MERGE(\n" +
            {   
              childFp: child.fingerprint,
              childTypeFp: child.typeFp,
              parents
             })