Niq

My husband had a interview Jan 11 and was given a 221g requesting for medical and additional relationship evidence and to drop his passport at the designated drop box. I have two dependents on my taxes, which is my grandmother and stepbrother, and I failed to tell my husband about it because I didn’t know they were going to ask about it and she was so focused on my taxes thinking I had children that she didn’t ask for any pictures or history of our marriage, so for three weeks we were put in administrative processing and my husband was emailed on the Feb 2 saying the CO requested a follow up interview. Has anyone experienced this and can tell me what to expect?