More Relatives being recognized in family tree.

Hey so in my game I have cousins who grew up and had families of their own but their kids do not recognize each other as second cousins or at least cousins or relative. Same with the kid and the young adult they also don't recognize that their related they can't be labeled as cousins. Or Great Aunt or Uncle. I don't know if they recognize the in laws like mother, father, sister brother, in law. Aunt and Uncle Cousin in law.