Please don't kill me, I'm perfectly willing to accept it if I am BU due to the fog of late pregnancy exhaustion and hormones, so try and be nice 
My parents mind DD for two days a week while I'm in work; she spends my other 3 work days in creche and the weekends with us.
Lately we've been having confused moments with her, where she's insisting on using words other than the ones she used to use; a sheep, for example, is now being referred to as a 'bala', and we seem to have lost chicken, cow and a good few others as well.
It turns out that my mum is calling a sheep a 'baa-lamb', a deer a 'bambi', and a chicken a 'cockadoodledoo', and other things along the same lines; not just animals, but food and things as well.
I know it's probably unreasonable and petty of me, but it's annoying me a bit that we're teaching her the right words for things, and she's ending up using made-up versions that we don't always understand. I'm loving that she's starting to be able to ask for things she wants now, and it's no use to anyone if she's asking and asking for something and we haven't a clue what she's saying because she's using a word that we don't recognise. Given that she spends time with three different sets of minders during the week, it seems obvious to me that we should all call things by their actual names so the others have some chance of working out what she's saying!
I've asked a few times but it seems to be happening more and more, and I'm reluctant to keep labouring the point if I'm just being silly. I know that their time with her is theirs, and I don't interfere if I can help it, but it really would make life a bit more straightforward for us if they'd stick to our approach! And to be honest, I just don't like her using baby versions of words when she's perfectly well able for the real ones. I can't shake the feeling that if that's the way we want to parent (and we both do, most emphatically!), then that's the way it should be done.
Go on then, pass the biscuits : )