Randomize to select the youngest child in the roster

Hi All,

I need help to write the syntax for the below.

If I have a roster of families leaving together where the head of household have two wives and 6 children. where both wives had 3 child each. There are some sections that one of the mother who has a child between 0 and 5 years should be interviewed. May while the two wives has a child within the age group. So I need the syntax that will allow the script to randomly select the mother with the youngest child.