My friend, due to an accident, discovered that his daughter's blood type didn't match,

so he secretly did a DNA test, and the result showed the child was not biologically his.
Later, he confronted his wife and they divorced directly. After the divorce,
she had nowhere to go for a while and temporarily stayed at her friend's house. Over time, they resumed their previous life.
She later proposed remarriage several times, but her friend refused each time. A few days ago, she brought it up again, and her friend still didn't agree.
She thinks her friend is still holding a grudge about the daughter not being biological, so she said, "If you really can't get past it, you're single anyway, just marry the daughter."
She also asked her daughter, and surprisingly, her daughter was willing.
Her friend asked us, is this legally possible or not?