LOL, I guess not.
My sister in laws family (my wifes sister) has been adopted in a way by my extended family. They vacation with us and our kids all grew up together more or less. After they became of age, one of my cousins sons (the son is my first cousin once removed as far as I can tell) asked my wifes niece out on a date. All the other kids freaked! They thought it was "icky". These two people couldn't have been less genetically connected if he was from China and she was from Alaska. Nevertheless,,,,,,,:^}