Have you or would you ever...

Do something sexual with someone who was married into your family (no blood relation at all)? I fucked a family members husband before they got married, and then once again when they split up. Their split had nothing to do with me. He's 15 years older than me, and took advantage of it The first time. The first time I was a stupid teenager, the second time I was highly intoxicated. I know, it's not right. But has/would anyone else do this?