The first member of the roster should be the head of the household

User Support Form Building
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You could do the same as outlined in the image below:

In the survey tab of your xlsform:

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In the choices tab of your xlsform:

Image 102

Data entry screen as seen in Enketo: when a wrong entry is made

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Data entry screen as seen in Enketo: when a correct entry is made

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Reference xlsform:

Head of the HH.xls (28.5 KB)