Hey Jenny - even if most of your photos are family oriented think about what sorts of activities they are in to. Although from the photo in your signature, it looks like the kids are still relatively young, so that may still be developing.
For instance, as the OP noted she takes lots of sports photos including low light because son plays ball. I too do a lot of low light action for that reason. DS played football and I'm still doing sideline shots for one of our booster club fundraisers. Also, both of my kids - well actually the whole family - are active in the performing arts area. So those production shots have their own challenges in terms of light, action, and distance.
If you're already doing things where you're at a distance, even tball or the like think about a lens with more flexibility. For years I used and SLR set up with multiple lenses but since I went to my Nikon with a 28-300 lens it is like going to heaven. I have HUGE flexibility in formatting my shots without changing lenses. Not the easiest thing to do when the action is flowing! Of course there are still other options I'd like to play with but for 98% of what I do that range is perfect.
Deb