I own BM66, MET, and AFMr. For a family friendly theme you can't beat BM66. I love my MET but swearing is an issue with young kids and could turn you off. AFM is a classic, awesome callouts, fun and fast. All three are great Lyman pins and you couldn't go wrong.
If it was me in your position I'd go BM66 in a heartbeat. Theme integration is awesome and is only getting better. Plenty of mods available as well.