Thanks everyone - sometimes I feel like I'm too sensitive, or I push too hard, so it's good to get some feedback that I wasn't wrong when I saw that transfer back into checking.
The trailer is fully paid for; MIL wanted to finance it, but we put our foot down on that one, for this very reason, and hubby is in sales, he negotiated a screaming good price for it b/c it was a cash sale. We knew it was going to be hard enough for these two to live on a fixed income; adding a mortgage payment would have been disastrous. When FIL was complaining about his lot rent going up $50/mo next month (to $575), I reminded him that the low cost elder apartment complexes in the area charge $1,100 for a small 1 Bed, 1 Bath unit, and they go up every year too, without fail. He's got a 4 year old, high quality single wide 3 BR, 2 Ba unit, with a split floor plan, making it very easy to take on a roommate and only have to share the kitchen. That too, he doesn't want to do. Have it your way, then!
The mobile home park is thriving and actually doubling in size right now; it's not your typical place; this thing is gated and has a clubhouse, pool, gym, amenity center, community garden, etc. Location is actually a hidden gem in proximity to our nearest big city; my concern there is that the lot rents will continue to go up b/c the land is becoming more valuable. Moving it would be a $10K expense, that thing isn't going anywhere!
I completely understand Hubby's guilt, I've got a sibling somewhere who will come knocking when her options are live in her car or the homeless shelter, and she's adopted a scorched earth policy w/me, but she'll forget all about it once she's desperate enough. In her case, she's done too much damage; I have to walk away, and I've made my peace w/it. I did give hubby the option of working another year or so, just to cover his Dad, and his response was a quick, flat out no, which I completely understand, but it's still family, and I can't imagine we wouldn't at least provide groceries down the line, if it came to that. But if I'm paying, I'm picking, and I don't shop at the most expensive grocer in the area like he does.