Repeat Group - How to limit number of time a question option can be used

Hello all!
I have an application with a HH Registration form that creates a Family Case and child cases for all individual household members. The child cases (individual case type) are created out of two question groups currently - one is a head of household group; and one is a repeat group for all the other members.

I want to streamline this if possible, by putting all the questions into the repeat group (eliminating the head of household question group).

Is there a way to include a “Are you the head of household?” question in the repeat group, but only allow one person to say “yes”? I can’t figure out how to do this, if it would be a validation condition, or something else.

If anyone can point me in the right direction, I would really appreciate it!

Thank you!
veronica

Hello all! I am sharing a solution that I found, in case anyone else is interested in this in the future:

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