king of the house

He's the type you'd be wise to tip-toe around. You offend him and he'll hold a grudge forever. His name reflects his personality better than most. He's smelly and rude and lets loose a string of profanity at the drop of a hat.  He must be given treats. He must not be yelled at. He must be pampered. He's very clearly the king of the house.

And he's my mom's cat.

Rascal is his name. And he's the most curmudgeonly animal I've ever met. He has a history of urinating on whomever/whatever has offended him. Case in point: while home for a short visit, my sister once yelled at him, he crept in her room while she was out, and she returned to a suitcase full of rank-smelling clothes. We've learned that if you shut the curtains in the living room and block Rascal's view of the sun, he'll let loose on them. I dared to step around him with an armful of laundry (neglecting to pat him on my way) and was treated to the most savage sounding hissing I've ever heard. And today a few hours after a I politely asked him to go into the other room while I vacuumed (Really. I spoke as congenially as I could muster), I discovered that he had again relieved himself on the mirror on the door that houses the vacuum. And now I can't get the stench out of the hall.

He's completely psycho. How do I get through the next 4 days at home without my mom to pacify the beast?