The players have chosen from the possible list of pre-generated PCs. All the other pre-generated characters have been tagged as NPCs.
My brother (45 year old, male) will play the wizard Nim Uboulg. He wants to be able to advise his boys as they play and so chose to be the intelligent character. In addition, a wizard is extremely hard to play at low levels and not for new players.
I’ve also come up with a system that I like and should work for young children. Basically, the rules under the cover are exactly Pathfinder RPG rules. We have full blown character sheets and spell books and an inventory of equipment, etc. But I’ve got a simplified character sheet with just hit points and coinage on it. In addition, the simplified character sheet is divided into four grids: a large character picture, a box for carried equipment, a box for not carried belongings, and a box for action cards. I bought a bunch of equipment cards and have given all three characters a complete set of cards for all their equipment, skipping some of the really mundane stuff like clothing. A bunch of action card were made up for all their special actions so that they don’t forget what they can do. The instructions to them are to just use each card in a creative way. So, for example, they could use the bag of marbles card to lose pursuing monsters or the hammer and pitons to climb down a narrow stone shoot. We’re also using miniatures and color maps. I’ve never used minis in a game, so this should be fun.
If time permits and the simplified system works, I’ll take a bunch of pictures to let others see how we brought in such young children to play an FRPG.