What is in your transfer notices?
My friend's case was transferred to local office, she is principal and has a husband, and her notice says "transferred for interview" and her husbands notice says "transferred to reduce backlog" (or something like that). They did not receive invitation/s for interview yet.
So maybe it is possible that they will interview only you...
In my case, all 3 transfer notices (me, spouse, child over 18) say "transferred for interview"...still waiting for interview letter...