My wife does not backpack. I doubt her troubled back would allow it.
My oldest son does like to go along. We sometimes use just my canister stove for food prep. Miah likes to use his own diy wood and alcohol stove. While we stay close together, weight savings is only minor. We both carry our own Hammocks but the two of them weigh about the same as a 2 p tent. Maybe even less. We share my water filter. We alternate who pumps the water and often just do our own. I have a two pound two person tent that would save a couple pounds. I snore badly though and after hammocking it ,I dont care if I ever sleep on the ground again. If weather got exceptionally cold, I could always pitch my hammock on the ground. We each do our own food prep but swap our diy dehydrated meals. He did use my sea to summit pocket shower one time last year. If split up I am sure we would both survive. He would be minus water filter? He has a steripen but often doesnt bring it. We like that the filter removes visible particles from the water as well.