They are unrelated by blood and she was 31 when they first hooked up, so I don’t have a problem with it.
Musk family potency at work? LOL
If you follow the Bible, there is this:
Leviticus 18:17
‘Do not have sexual relations with both a woman and her daughter. Do not have sexual relations with either her son’s daughter or her daughter’s daughter; they are her close relatives. That is wickedness.
Biblically, it’s incest and highly forbidden.