First post, so please be gentle!
Partner and I have just moved into our new flat and, in the first few weeks he gave a key to his parents for safe-keeping (they live an hour away). I didn't like this idea - have never given a spare key to anyone before (don't tend to lock ourselves out and it would be difficult to get out to parents-in-law to collect key if we needed it, anyway -would have locked wallet/travel pass/car keys in house too, presumably). But, it was a busy few weeks, so didn't think too much of it. But now I have - and have asked partner to ask for key back (opportunity has arisen for this to be done nicely and diplomatically) - and he's refusing.
AIBU to expect that I should have a say over who has keys to our flat? Parents-in-law v. nice, btw, and unlikely to drop in unexpectedly, but still...