Background so as not to drip feed: FIL loaned us some money to buy our house, which meant we avoided a mortgage. I'm freelance so this was hugely helpful. He also has been great at helping us renovate, put in a new kitchen etc.
However he's constantly referring to it as 'his' house, saying he owns it etc. I put six figures into it so this doesn't really thrill me tbh. I know he's saying it in jest but it rankles.
He wanted to do some work on the kitchen whilst we were away, so we gave him some keys. He didn't return them, but more as an oversight.
He was due to come over today, and has just let himself in. I'm fuming but being polite. I wouldn't ever let myself into someone else's house without so much as a knock. I was getting dressed and it felt like a complete invasion of privacy.
Sigh. I'm probably overreacting but grrr.