Asking on behalf of my brother.
My brother is a Canadian citizen, being sponsored by his US citizen wife. They have 2 kids together. She previously sponsored his ex husband.
My sister in law said USCIS told them they need to have DNA testing done for the 2 kids to prove the relationship to my brother (their father). This made no sense to me and I'm not sure why they would need this. Both kids were born in the US and he is on the birth certificate as their father.
Is there any way in which USCIS would request this information?