If my great uncle-in law has a daughter from a previous marriage what is my relation to her. If that daughter has a child of her own what would my relation to that child be?

Answer 1

Your great uncle, the man who married your great aunt, has a daughter from a previous marriage. Unless your great aunt adopted her, that daughter is not related to you at all, and her child is certainly not related to your child.

Of course if the great aunt and great uncle married while the daughter was very young, she may have been treated as a member of the family by everyone, so she would have been treated as if she were your parent's first cousin and your first cousin, once removed. In that case, you might choose to treat her daughter as if she were your second cousin, and her child as if she were your child's third cousin.