In reply to jonnie3430:
Camping with children presents a conundrum - when they are small, they will want to be in with you, so you need a larger tent, but when they get into their teens, they will want a tent of their own - if they are of opposite sex, one each!
I don't know exactly what sort of camping you have in mind, how old your children are, how far you are prepared to walk and what time of year you will be camping in, so it is hard to offer specific advice, but for younger children, I would definitely consider a larger tent, maybe even something like the Robens Green Cone tipi tent - looks like a strong design, and it would offer a good family space. Does weigh 6kg though (but this can be split).