Sky club access for family of 4

Ok I know this has probably been gone over ad nauseum. And I’ve read the new guidelines - I’m just hoping I’m missing something.

Four travelers: me, hubby, daughter, and my mother. Hubby has reserve card and I have platinum delta Amex. I know he can get himself plus two immediate family members into SC. There’s no way to get the 4th in, right? Mom and I are flying FC but we don’t have status and it’s domestic.

Only way for this to work would be for me to become AU on the reserve card, right? Or hope for a nice team member at the door who lets us through (which would also depend on capacity I imagine).