I am the opposite of a pack rat. If I am not using it, it is gone. If your FIL likes it, sell it or give it to him (depending on what you need to do to maintain DIL's approval).
I use all the cookers I own. If not, I'd sell the one I didn't use -- except the redhead. Everything else is expendable.
If a grill or smoker isn't used, is it really a grill or smoker?