We have a mini and find it is "cozy" with 2 adults and a large dog! Can't imagine it being effective with kids. The bathroom/galley hallway is pretty tight and the sofa sits 2 adults but I question seating for 3. If you get the dinette model it may be different. My main objection to the dinette is if someone is sleeping on it, you have to step on them to get out of bed and it has less storage (nothing on the outside). We have a small storage area on the outside of the sofa (lounge) model.
All that being said, it depends on how often the children are with you camping and their demeanor. The mini is perfect for us and Oz loves sleeping on the bed! He doesn't get to do that at home
Judy
2010 Trailmini
2007 Buick Rendezvous