I have to confess to having some similar feelings when my mother was staying with me after the birth of my second child.
She stayed a while, it was her idea and she seemed keen to help in certain ways that she stipulated in the lead up to her visit - all thought up and suggested by her.
She was going to do all my cleaning and ironing, and keep the house ticking over, and told me to cancel the cleaning agency because they would get in her way and she could "do it better". She also said she could help with "lifting" of my older child (getting him in the car seat, etc) because I was having a c-sec.
She could not lift my son - which isn't her fault, but its scary how much weaker a woman in her 60's is than one in her 30's! You really do lose lean mass if you dont use your muscles. And she does suffer from back twinges etc.
Consequently, she cleaned once in the whole 8 weeks, it was a quick spritz around the ensuite, and a hoover. The rest of the time, she'd only do anything if she saw me doing it, and her idea of hoovering was getting the hand held one and picking up the bits!
Her idea of ironing was to say "I must iron tonight" and then drinking 4 large glasses of wine and not ironing. She'd say the "I must iron tonight" when she saw me grabbing things out the ironing basket and quickly ironing them before preschool, etc.
None of it mattered really and I wouldn't even have mentioned it on here if she hadn't sold to me how helpful she was going to be - she just didn't deliver in the way she meant to. I wouldn't have cancelled the cleaner and ironing lady had I know, but we managed nevertheless.
She was helpful in other ways, though, to be fair - if nothing else she was a pair of arms that you could chuck the newborn into when you had to get up and do something - rather than in the moses basket - she could always cuddle a baby, even with a wine in one arm!
On the subject of parading grandchildren - I get a little of this from my parents. Mainly my dad. He's very "hands off". He basically ignores them, but in a kind way, if that's possible. Except when we visited recently (they live abroad). But, when my brother and his girlfriend turned up for a visit, they were suddenly all hands-on and boasty - sort of like, look what good grandparents we are!!! You should really get on with it you two!!! We want more grandchildren! kind of thing - didn't bother me so much as my husband, that really irritated him as just that morning my dad had been tsking to himself because my 7 month old was sort of squealing and shreiking while he was trying to watch the news. (Had to shut her up with toast in the end as was getting evils)
Mustn't grumble though eh?