Does he have the landowners permission to be on the land? If not and i realize that this is going to open up a rather large can of worms have the landowner talk to him then if it happens again have him charged with trespass. Hope your on better terms with the landowner than your stepdad.
i think he should stay away because you will never kill that big buck if he keeps going around the stand cause when that deer gets within at least 1 to 200 yards from your stand and he smells the odors chances are that buck will never return until the smells are gone. he will come in time to time but it won't be within even rifle range so tell him to stay away from the stand.
Rather than spend my hard earned pennies on those cool Shoot-N-See targets or even the preprinted targets at sporting goods stores, I save a few bucks for weekend plinking sessions by using paper plates as targets. A 100 count pack of paper plates costs less than a 10 count pack of preprinted targets.
If you are playing with something like a semi auto AK, or building a young shooters confidence with a 22 or shotgun, those big eight inch blanks are perfect for putting holes in all...