They certainly don't need any help in turning the kids against them, they do it squarely on their own, I don't say anything bad about H to my kids, S made up his own mind on the weekend when he saw H, H hardly even spoke to S or his girlfriend, virtually ignored them and if he did speak was agro with S.
I do need though by tomorrow to have a plan in place for how I will react towards H when he comes home if I happen to be here when he does and also if I come home after he does (I have no idea when he will be home).