And OMG your FFIL peed on your house? Ewwww! Did anyone say anything to him? I would have been livid.
I noticed when I went to let the dogs inside. They were both standing up on the house and sniffing....yeah there was a wet spot just about at the right height. I haven't told FI about it because I know he will be so embarrassed.
i can't even imagine how that conversation with FFIL would go....."excuse me mister, but you cannot pee on my house. Not just that, but we have a chain link fence and our neighbors have young children. Next time please go into the bathroom and pee INSIDE the toilet, not around it like the last time you visited. Thanks!!!!"
Good luck figuring this out, looks like the other posters had the best advice -- having your fiancee directly address this with the future FMIL / GMIL.
How not fun...family can be a real pain sometimes, huh.