You can but it has to be something that everyone is okay with.
For me I view all my relationships (even my ones with my metamours) as equal and non-hierachal. I know that's not necessarily the case for everyone else in the family but it's how I work.
Woodsmith: My husband
Merry: Tig's wife/slave
N8: Merry's boyfriend/owner
Elle: N8 girlfriend
Ruby: Part of the Leather Family
Logan: Leather Sir in the Family
Arc: Logan's boy
Holly: Leather family
K: Holly's sub