I got on this site a little over a year ago. Best thing I did was to go through my pack and look at every piece of gear I had and ask "do I need it?". If so, can I make replace it with something lighter that doubles duty for something else? If not, get rid of it. I saved a ton of weight by doing just that.
Then we replaced sleeping bags, tent, cooking system, all of which were dated and heavy. I researched every one of those here and looked for what made sense to us based upon our family needs and budget. After every trip, I've looked through all the stuff we brought and ditch more stuff if never used and not critical for safety (for example, I Wcarry an EPIRB that weighs a pound).
With kids, I have kept their weights very light. My son is now 9 and fits into an older women's Golite jam. He can carry his Northface tigger bag, his clothes and foam pads for he and his sister and still only be less than 7 pounds leaving room for water. Sister, 6, carries a very light Kelty day pack that just barely fits her Tigger bag, clothes and small water bottle. They do great with these loads, and also frees up space and weight from mom and dads packs.
Lightening up starts one ounce at a time and the scale is by far your best piece of new equipment.