A lot of people in my family stutter, including my sister who has 2 kids. Both of her kids however, do not have stutters. I can't say if there is luck involved, but one great thing that comes out of a stutterer having kids is the fact that your kids are raising awareness. My sister stutters constantly in front of her kids and they know what it is. Which means when I do it, they don't have to ask or mock me and they just accept it. It's honestly a pretty cool practical lesson to teach kids at a young age: not everyone is perfect but it's worth giving everyone a fair shot.