DH works all week and some Saturdays so we like to spend time together at the weekend with DC.
I used to see the inlaws frequently ... but not too much! (say once every three weeks/month) and they are 'hard work' - description by DH.
I thought he was being a bit tough on them but now understand what he means.
Since I'm on maternity leave I now see them at least once a week and it's getting me down.
They are overbearing, are competitive grandparents and spend over 4 hours at our house at a time.
I've tried to steer visits to their house, which usually last 2 hours, but I think they don't think this is long enough so always suggest coming to ours.
I found them lovely people when I saw them infrequently but as I've spent more time with them my MIL is manipulating and FIL passive aggressive.
They don't understand how busy DH is and think I sit at home with my feet up all day. FWIW - I don't!
I loathe the visit day and get worked up about it a couple of days before! But know they only want to see their GC and would never dream of not letting them spend time with DC.
They are both retired and quite old so I don't want to leave my DC with them at such a young age so am currently left to entertain them for 4+ hours and make endless cups of tea and small talk.
Sometimes it's not that bad but sometimes I just can't cope!
I'm having a can't cope day today.
I've made up excuses like needing to go shopping before, but they just come with me.
I don't mean to be nasty, it just tires me out (especially without DH's support) and I'm not stupid enough not to realise that they may feel the same way about me but put up with me so they can see GC! 
AIBU? And how often do you see your inlaws?