I bought my RIB so that I and my family could enjoy a hobby together, unfortunatly the wife decided that it wasn't for her, after buying the boat!!
However I'm still keen on my children experiencing some of the action, but can only safely take them out one at a time unless a friend/s comes along. I will try to give you some obserations I have made:
1. If travelling with children and you're by yourself, it's handy to see them all the time. A large jockey console seat is good, as you can put a child right in front of you and give you and the child confidence, alternativly some seating forward of the helm should suffice, give em a strap over the seat to hold on to and off you go.
2. Seating arangement is all important as mentioned before, but there will be times children will want to stand. Two jockeys side by side gives a space between and if you join the back rests together or have a storage box behind, it is a convenient and relativly safe standing position with grab rails in the form of back rests around.
3. If your children like to roam, stick safety harnesses on the "D" ring of their lifejackets and make sure that its only long enough to let them reach the tubes and not overboard or near the outboard.
4. Carry plenty of spare kill cords, keys and anything else they can throw over the side and watch that DSC Emergancy button on VHF (unless you want to be botherd with Air Sea Rescue)
5. Some form of helmet is essential, espetially if they sit in front of you at the helm. That steering wheel is very close to their heads and one stuff into a wave and you'll knock em out (and damage your steering) a biycycle helmet is ok or a professional one is even better as it'll have a visor that'll keep the spray away.
6. If you getting a Boat for the first time like me, and launching from a slip consider the possibility of upgrading you car to something with 4WD as I can't garantee a recovery by myself and have been helped several times by friendly persons with 4X4's.
Hope this little insight helps and hasn't put you off too much.
Good luck RIB searching at the weekend,