DH & I often share space but with me on GN and he on his footie forum so not communicating! Such as now!
However we are both busy people and off doing our own thing but do spend time doing things together ..including crosswords, jigsaws, film, theatre, eating(in & out) sharing articles in the press, socialising with friends etc etc.
I suppose the problem on this thread is that it appears a deliberate action by cheerlus BiL. Either he wants a confrontation but does not know how to manage it or is trying to manipulate it so it becomes wife's issue. Either way my advice is that she takes control of the situation and makes a decision that suits her.