We live 2 hours away from family, and just moved to a new city. I was going away for one night to a good friend's hen last weekend and DH was in charge of DD, just 6 months. He had only ever looked after her for a couple of hours before, so I suggested he ask his parents to come down to be a bit of extra support (MIL is, in fairness, great with babies!). He did so and a couple of days before I went away I texted MIL saying thanks so much for coming down....if you have any questions about DD's routine, food etc, give me a call. DH was a bit 
at this as he admitted then that he hadn't asked them to 'help' as such, just to visit, although they obviously knew I wouldn't be there.
Anyway, I left on Saturday morning before they arrived, and raced back from the hen on Sunday am (3.5 hour drive, ugh) to see them at lunchtime as they were leaving early. I had stocked the house with food, wine etc for them. There was were loads of dinner foods - chilli, meatballs etc - in the freezer, but DH said not to defrost anything as they might want to go out or get a take-out for dinner. I said to DH on Saturday am that the only thing we didn't have was fresh fruit (I had gone on a health buzz earlier in the week and eaten it all!) so to get some from breakfast on the Sunday. I arrived back to a house full of food that MIL had bought in the supermarket; fruit, which obviously DH had failed to get, but also things like, a particular brown bread that they prefer (although I had perfectly good brown bread in the fridge!), the breakfast cereal they prefer, again, I had a selection in....etc. They had, for a reason that I think has much to do with DH's taste! and because DH and FIL went out for drinks with DH's uncle early on Saturday evening, take out pizza for dinner on Saturday night; from the very nice local delicatessen-type pizzeria.
They left on Sunday amongst much awkwardness about taking their cereal, brown bread etc with them....comments from FIL about him leaving a bottle of wine in the fridge for us to enjoy (despite there being practically a wine cellar of wine in our kitchen already!), and just a general weird atmosphere.
Also, and I admit I may well BU at this, even though they hadn't seen DD in a few months (not due to lack of trying by me!) they didn't bring her anything; not that I expect big gifts, she is spoiled rotten by my family, but not even a token little book, teddy or anything. They shower their other GC with gifts all the time (their DDs children). On the Sunday morning they even went to a big hardware shop to get something (which cost £££!), next to which is a large well known shop which does children's clothes and toys - but nothing!! Also, I'm doing some purees (at nursery and in a hurry) but do finger foods at home with DD and really enjoy it, she does too. MIL then brainwashed DH that DD isn't ready for finger foods and that she isn't able to swallow them....grrrrr! DH was v impressed that she fed DD with 'no mess' and asked me why I couldn't do the same?!!!
Granted this is a bit of rant; I generally get on with them, but I just thought the 'shopping for themselves' thing was odd, and have been thinking about it all week! Were they being weird?