<human>: My fiancé and I have been together for two years. He's an old friend of my brother's and he's a wonderful and loving person. I never really had a major problem with separating him from his family's actions and have absolutely no trouble seeing him as his own amazing and strong person.

However, many members of his family are not. His grandfather was basically evil. He spent the last years of his life in prison. My fiancé's own father is not much better. His mother is the only legitimately nice person, and I think the only reason my fiancée turned out okay is because his dad doesn't actually like spending time with him. 

Like I said, my fiancée and I have been together for two years so I have no trouble not seeing him as a member of his fucked-up family. But for some reason, I keep thinking about the fact that I'll be taking that name. And when we have kids, they'll have genes in common with his pretty rotted branch of the family tree (grandparents, aunts, uncles, cousins, etc). I hate that I'm hung up on this and I wouldn't ever want to mention it to him, but I can't stop thinking about it. Not changing my name (or having him change his) isn't really a good option for a couple of reasons.

Can you give me the gist of the text in a nutshell?
<bot>: It worries me to think about my kids being connected to my fiancée's family by genetics and last name and I need to get over it.