Hi there

I came across this site today while looking for info regarding an upcoming backpack trip. My kids are 7 (boy) and 10 (girl). My stepdad has planned a 5 day trip this July. I am wondering if his 7 to 10 mile days are too lofty for children this age. I am thinking yes, if I know my own children. They will be required to carry light packs, sleeping bags, and their own hydration pak. We have hikes with our children before 3 miles max and they had had enough.
What is your experience with kids this age? If we start training now do you think 7 to 10 mile days will be possible? I hate to sound negative, but it sounds like a lot to me and I could spare everyone a lot of whining if I back out now.
thanks