Get children of members

I have a list of people, some are members, some are not, and some are children of members (also not members).

I need to get all children of each member and concatenate them into a cell (Children in column E). Obviously, husbands and wives will often have the same children.

My fields:

First Name.......Child.......Membership.......Household ID.......Children
Bob...................FALSE.....Member.........1234567............Larry, Cindy
Larry.................TRUE...........................1234567
Amanda.............FALSE.....Member........1234567.............Larry, Cindy
Karl...................FALSE.........................7654321
Cindy.................TRUE..........................1234567


I have attached a parsed down file with an "Actual" and "Desired" look. Mind you, we have many more people than I show.

Note:
All members will have Household ID. Some of the older entries did not.
The membership column may say "Visitor" or "Non Member" or just be blank.
There can be up to two adults in any household.
I don't need children of non members, but if it is easier to figure, that is fine.
Not all columns are shown.

I thought about using an array with the Household ID as a dimension, but there are nearly a million integers (not a million actual households). Honestly, if I just had some direction on how to approach this it would be very helpful.

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