Perhaps, you can refer to this https://docs.getodk.org/form-repeats/#using-additional-repeats-to-follow-up-on-repeated-questions
and
to make it able to select the household member, you may need to perform one calculation:
-
use join function to join the previously entered household member into space-separated string
-
use select_one ${space-separated string} #creating a choice list
The link below having similar concept here, but it used concat functions to join two choice list
1 Like