For most of us, this ain't a hobby, whereas, their jams, jellies and home-made jerky probably are.
I often find it funny (disappointingly like) how many people disregard the value of your abilities until they need/want you and then forget about them after you finish and it becomes uncomfortable to talk about money, like they are doing you a favour just by letting you practice on their equipment.
People will flaunt and flash cash, credit or cheques for anything that makes them look good, but for something they can't see, it has no value, should cost nothing to repair and should work forever.
What family & friends do for me in my everyday life dictates what I will charge them. "Hey!" once in a while over the fence don't cut it, especially if I'm the guy doin' the "Hey!" first most of the time.
Dad & wife's parents get repairs for nothing only. Most of mine and the wife's sibs have job skills that are useless bartering tools. Some do and I will.
IF you don't like the arrangement, fix it until it works. Make sure it isn't you that can't sleep at night. After all, you gotta be sharp in the morning.