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Are Caroline and Justine part of the "Velvet Room Family"?
I mean they talk about 2 older sisters when you beat them and they give you a useless bookmark.
I'd imagine their two older sisters are Elizabeth and Margaret. Otherwise why mention them at all?
But they didn't mention a Brother (Theodore)
The better question is whether Mona is part of the Velvet Room Family.
Theodore is only semi-canon. Surprised he even showed up in Q.
Good point
He showed up in one of the Arena games as part of Margaret's story though
Oh god imagine if we get another persona q
I my be wrong, but there is a talk of making another persona q with the addition of Persona 5 characters in the future. Just don't know when that will be.
Atlus make good persona games plz
@ Sovereign: Theodore is 100% canon. He's in not only PQ but also Ultimax. FeMC isn't canon; Theodore is.

To answer OP's question, they... technically count, but it's Lavenza who is the "true" Velvet Room sibling