I normally only lurk but I'd like to check with the Mumsnet jury on this one...
Getting married this autumn. Inviting all cousins and their families. One cousin has new-ish girlfriend (about 2 years I'd guess) and who I've met a couple of times and seems really nice. She has two pre-teens who I haven't met. Of course I'll invite my cousin with his girlfriend, but should I invite the kids as well?