Focusing on good family photos during your photo session is always a good idea! Unless you’re going to set up a camera on a tripod with a timer, you just don’t get all family members in the same frame. That’s why people go to a professional photographer!
Big kids! They don’t run from you like toddlers, but sometimes photographers need help because older kids can sometimes be timid at first.
I’ll preface my advice by telling you that it helps when you know a family. The ‘warming up’ period goes pretty quickly and they’re ready to laugh and have fun with you. So, keep your clients if you can!