She was middle-aged when she was recognized as a noble daughter

When they told me I was the real heiress, I was already 45.

Married, with three kids.

The day I was supposed to return, before seeing my elderly biological parents, I overheard a conversation between my biological younger brother and the fake heiress:

"Why bother bringing her and those mutts back? She's been out there for decades; who knows what she's become, what kind of man she married, or what kind of no-good degenerates her kids are?"

"You're the only sister I've ever known…"

Mutts? No-good degenerates?