Restrict the age of a first member of the family to be greater than 15 years in a repeated group

@Rildwan, you could do it as outlined in the image shred below:

In the survey tab of your XLSForm:

In the choices tab of your XLSForm:

Image 2

Data entry screen as seen in Enketo:

Reference XLSForm:

Roster Constraint.xlsx (29.8 KB)