Should I dump my boyfriend because of his speech impediment?

Your family is being UNBELIEVABLY shallow! I have a speech impediment myself (a stutter) and one of THE biggest fears about getting into a romantic relationship is the fear that the girl will be wierded out by the fact that I sometimes have trouble speaking. I am at least glad to hear that YOU don't think any less of him for something as trivial as a speech impediment. Does it hinder his efforts at work? From what you have written, no. Does it influence in any way how he treats you, his gf? Again, no. Absolutely tell you family in no uncertain terms where to go. They don't have to date him, they just need to accept the fact that you are. So he has a playful side and isn't always serious (he gets along with your nephews) - he's great with children, so he'll be a good father. Again, it doesn't hinder him at all if he's got his own place and a good job. Your family are entitled to their opinions, I guess, but to try to force you to comply with their opinions is very unfair. If he's honestly NEVER done anything bad towards you (and from your post it seems like that's the case) then you are clearly happy with him so stay with him and put your family in their place.