Can you say to him, "FIL, I paid money of my very own to PURCHASE this house. It is now my home--my only home. And my husband and I own this house--you do not. Nor do you live here--this is not your home."
And I might send him home the minute he makes any sort of comment. Don't be snippy, but just say, "well, it's time for you to go--I need to have my home to myself now." And usher him to the door.
Sort of a behavioral-modification tactic.
Or maybe just repeat the same sentence over and over? "You don't live here, and you don't own this house anymore. We do."
It might make you feel better. But it's probably not going to change him.
And bah12 is right--he's not that likely to change. Don't argue the point.
Think of him like the grownups in the Charlie Brown movies--when he talks, it's just "wah wah, wah wah wah."
It' snot like it MATTERS what he says, right? You don't need his permission to move anything into or out of your house. You can set it in his travel trailer, or toss it, or arrange for someone else to get it.
In fact, you might have better luck if you completely purged the house of ANYTHING that was owned by anybody but you and DH after you purchased it. You might have been better off if you'd completely emptied it and started acquiring things from scratch. It might have made the point that "this is my house now."
So maybe do that now. Get rid of everything--whether your'e going to redo the floor or not. It's not your stuff, so it doesn't belong in your house. And say those things, "It's not our organ, FIL, so it doesn't belong in our house." Get rid of it NOW, just because. Just because, well, it's not your stuff, so it doesn't belong in your house.
"It's not our sofa, so it doesn't belong in our house." Even if it means not having a sofa.
Think like a tomcat--mark your territory. Make it smell like you.