I'll try to keep this short. We sold our old house and the buyer moved in at the end of June. He's a single guy, just a couple of years younger than us. During the run up to the sale he was a bit of a PITA, we had to do lots of hand holding etc and his parents kept coming to the house to 'measure up' (never measured a damn thing) and would spend HOURS chatting with me and not showing any interest in the house at all.
We put up with it because he was willing to wait for our new build to be ready before he moved in, so that saved us the cost and hassle of renting. We also felt a bit sorry for him as he's just starting out for the first time, so left him quite a lot of extras not included in the sale of the house to help him out, chased up his solicitor for him when things stalled because he 'didn't know how to', left him loads of info about the area, who his neighbours are, when the bins are collected, left him food and a welcome to your new home present and card - basically anything we thought would help him settle in - he was very pleased!
Now I'm begining to wonder if being so nice was a mistake. He has my mobile number and has sent texts on and off all summer asking daft questions about the house, all of which I've answered and have even called him to talk explain stuff in more detail when he's been confused. He's also turned up unannounced at our new home which we didnt give him the address of and we dont know how he knows where it is for no particular reason, dropping off junk mail that he 'thinks is for us' 
so far, irritating, but no big deal really.
until monday night, when his mother turned up at our house unannounced and barged in asking me to come and sort out his bloody heating! 
There's nothing wrong with the heating, just he's not sure how to programme it to suit his working shifts.
me: "didn't he read the manual?"
her: "there is no manual"
me "err, yes there is - we handed it to you along with everything else - and I left written instructions because you asked for them - and there are instructions on the control unit itself"
her "oh, yes, so there is - well, can you come and do it anyway?"
now, this woman was not taking no for an answer so I stupidly agreed that DH and I would nip down for 10 MINUTES tonight to sort it. This was after me offering several days that I could come down and her saying that no, that time/day wouldn't suit. He wanted me to come then and there, or preferably on saturday evening, because that would suit her best. When I told her I had plans this weekend and couldnt come, her response was "well, that's not very convenient for poor DS" ffs!!
The house, by the way is in great condition, heating system is only a few years old as as simple as they come - its not like he's struggling in some old run down house with quirky appliances!
AIBU to think they are extracting the urine, or am I just being a bit of a Caah? I'm of a mind to set the damn timer for him and then make it crystal clear that we will not be coming back and he needs to sort things out himself from here on in - what do the MN jury think?