Is this weird?/Incest?

My partner of 3 years and 2 kids together, while I was pregnant with our second he cheated on me several times with someone who is basically family to him.

His uncle took the girl in as his own 18ish years ago. He refers to her as his daughter and she is closer to all his family than he is.

Is it weird that they have been sleeping together and still want to be together?

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