So, it looks like I might have this kind of situation, because I got yesterday 2 bio letters (for myself, I am the main applicant and my 4yo son). Nothing came for my spouse and my daughter, however tier 1 said today that letters were sent to them as well. I don't know the bio date for them, but ours is Aug 3, 2020. When I get them, I will update you. They could probably split us like - 1 adult + 1 minor, IDK.
Hello guys,
So, today I received 2 missing bio letters for my husband and the other kid. All of us are scheduled for the same day and time. i.e Aug 3, 2020 at Elizabeth Asc. I don't know the reason why letters came separately, they all dated same say by USCIS and sent out on the same day. Maybe that was smth on USPS side.