Mormon parents, which aspect would be hardest for you to accept from your child?

Hypothetically, would it be hardest for you to deal with your child being involved in a same-gender relationship, having premarital in said relationship, or that his/her partner is 20 years his/her senior? I understand no aspect is easy and it all causes disequilibrium with your family beliefs, but which part would hit you the hardest, or be the most difficult for you to come to terms with?