With DS, we ended up living with my parents for 5 weeks after he was born. It was absolutely the best thing that could have happened, they were just unobtrusively supportive and made the housework etc run invisibly around us. Food and drink appeared, washing disappeared and reappeared clean, baby was cuddled while I had a bath... It was all good.
However, we went directly there from hospital the day after he was born and PILs were invited round as well. First grandchild on both sides, we were trying to be scrupulously 'fair' although we didn't expect any aggro as such. We didn't know when I was going to be let out, so we just told them when we were on our way and I think they set off the same time. So, got to the house about 1pm, and was sort of 'on show' until the evening. In retrospect I should have bailed out much sooner with baby for some skin to skin in bed, and let them just sit around with DH talking about it. It's not like baby was doing anything particularly interesting (apart from one spectacular shit that dribbled down the leg, out through the poppers, and all over a grandad). Nobody's fault, just that I didn't read the signals and realise how tired I was and that I shouldn't be trying to be engaging.
So I would say if you have family or ILs who you know are going to come round, don't waste your energy fighting it, just be confident to do your own thing whether that is disappearing up to your room for a feed/cuddle/sleep, or asking them to leave the living room while you feed/cuddle/doze. They might be offended but stuff em. They might even get their act together and do some washing up/etc while they're waiting. It's slightly more of a challenge to find the words to suggest things like that, but most people won't be offended at being asked to help with some chores and then get a baby cuddle later, if it's an alternative to being told visiting hours are over, off you pop.
I am not making much sense am I... V tired, final exam tomorrow of my training course, I'm just trying to hold out enough energy for it.