Sounds like you are aiming for what I have been doing for several years. My wife has knee problems, so when we go out I carry all the crew gear, all the food, and my gear while my wife and kids (8 and 11) carry their own stuff. We went out in early June with temps down to around 40. My son (11) carried about 13 lbs, daughter (8) carried 11, a little more than I wanted her too but she has a good pack and was OK with it, wife carried 15lbs, and I was left with about 40 to start out with for a three day trip. In comparision, my last solo trip for 3 days was about 22lbs and now having replace some gear I'd be around 18. If you want more specifics PM me. Good luck to you all and have fun!