So I just learned today my 15 year old sister in law, who just turned 15 late July, is dating a 19 year old. My mother in law seems to feel it's okay because he's autistic. I disagree. I feel a 15 year old and 19 year old have nothing in common. He's already graduated and they met because he's her friend's cousin. I worry about her. I remember being in high school and all the dumb shit my friends did. Many of them dating guys way older than them and they always ended up using them or being abusive (or both). I just told her to be careful because there isn't really much I can do... do you feel him being autistic changes the circumstances or not?