This has happened twice now. I was out yesterday, dh was entertaining pils and our 2 young dds were at home. fil went to use the bathroom, came back down. Dd1 (9) went up afterwards, dh thought she was a long time so went up. she was in her room, had tried to use bathroom but floor awash with urine and splashed around loo etc.
Fil is able bodied, no issues (such as sight or balance problems) which might mean he did not realise what had happened. he does not do this at home. I have used their (carpeted) bathroom after he has been in on more than one occasion.
dh cleaned up thoroughly after they left...
he did not make any mention of it, let alone apologise or try to clean up.
Not sure how to handle this really, it does put me off inviting them as I think this is awful behaviour.
so as to avoid drip feeding the relationship is not good anyway (for many unrelated reasons).
Wwyd?