You should do a search if you haven't already as this has been discussed a number of times. But off the top of my head I can think of US LawShield, CCW Safe, and USCCA.

Also, no one can tell you what the best plan/organization for your family is. Search the forum, read the discussions, look at what each plan has to offer (and what they don't offer), and figure out what would work best for your situation. Some people have joined multiple plans that complement each other.