Find and Remove Current Family Sharing

How do I remove family sharing from my Apple account when I am apparently shared by with another family? My husband sent my an invite, but Apple says I'm, "already in another family," and I "will need to leave your current family first." I cannot find anywhere in my settings that identifies the "family" that Apple says I am already sharing. What do I need to do? I recently upgraded from a 6s to an 11 Pro Max. The 6s is still resident as a account device, but I do not see anything about this "family" on that phone.