Tricky deal, I feel for ya. When money and family and hunting all get tied up together itcan gosouth in a hurry. Especially with in-laws that aren't blood.

I like option three, but maybe with some twists. Ain't no need pissing family off, it usually comes back to haunt you. I would put some feeders up, but consider the locations carefully. Before you place them consider possible travels corridors, and how safe the deer will feel using them. If they are too far away across open country they will only be hit at night. Set them in some cover where the deer will feel safe, and have safe corridors to get to them. Then you have lots of hunting options on the corridors before the deer get to the feeders. I also wouldn't make the feeders obvious. No need to rub his face in it, just start killing better deer and let him wonder how you are doing it.

Food plots are good too, but are very visible. I prefer small plots with lots of edge and cover for hunting plots. Plant some good summer forage to get them used to using them all year instead of just fall, that way they are more comfortable there during season.

Maybe add some mineral licks here and there, all the little things help.

I have 3-4 acres in the corner of an ag field that none of the rest of the family hunts because they consider it too small to hold deer. It is really thick and buts up to a neighbor with lots of cover. I have been working in there for 5 years now, plots, trails, this and that. The first year I got one pic of a forkie. This year I have a 130" ten in there for the first time and no one but me knows it. A closed mouth catches no flies.