[imintrouble]

I come from a strange family too - I have nieces and nephews older than I - we are more peers than my siblings and I.

But that doesn’t answer your query.

I would use the term I often think of when it comes to explaining my own crew to others:

We are a custom-made family given all the love we share.
Custom Aunt and Uncle; Custom Cousin; etc.

[Jo Nuvark]

I like the heart behind “custom made” family.
Beautiful sentiment from a lovely person.