I think Sam should be assessed for autistic spectrum may be has aspergers... they should be able to do that at his school... I'm sure you're sister would be able to get it done.
Once he's assessed they'll have a clearer idea of how to handle things... if your sisters presents it to her husband as something that will help him be more comfortable and happier with his education rather than 'behavioural' the dad might not go on the 'defensive' and resistance which many parents do when confronted with own kids behaviour ...
If Sam is on any spectrum being assessed wil transgorm his life and everybody because he will get the support he needs and everyone will be able to read the adequate literature that explain so many things that aren't 'the norm'
May be the dad won't realise how serious the situation is until your sister mentions divorce ... but still approach from the education slant rather than behaviour ... education is for the child's benefit... behaviour can be blamed on someone else rather than the child...
The Brits have runs, the runs and runny everything! Including noses
And even when they think they're off to a running start, in the long run, in the case of diarrhea what matters most is having a dry run so you don't have to make a run for it! In which case running round in circles won't be of much help! If you're lucky it won't run in the family and you won't run out of time before they run it past you. They do say still waters run deep but in the case of diarrhea you'd proably wish you'd run out of gas before running into a stone wall!
I don't like killing creatures! Best mouse trap is a straight side tall bin with food inside ... push it back against something the mouse can travel on to get to the edge of the bin... once it's in, it can't climb back out up the straight slippery sides of the bin... I use the same bin to take them away and release them into the fields ...
The tread is not about women in general or women cooking or burning bacon but about inventions or breakthroughs that women made with far reaching results for everyone's life!
RE: My sister wants your feedback
Although I don't mran the chikd is to blame ...I mean his behaviour stems from him not caused by someone