Just curious

So my S/O is 18 and he Lives in Georgia. (I live in Kentucky ) he used to live here with me but he has to move to be with his dad. He wants to move back up to Kentucky with me. But he is to afraid to talk to his dad. He has to come to Kentucky to visit his mom this summer. Keep in mind that he is 18 years old. Can me or him get in trouble if I go to his house and pick him up. ? A friend of mind said we wouldn't because he is 18 and legally an adult but I'm so afraid of getting in trouble.