My Mum paid for my accommodation at Uni as I wasn't entitled to any help based on their income. They did resent this a bit I think. Not me, but the system which assesses the parents of adult children (I was 21) regardless of whether they want to support the adult or not.
My Mum also paid 4k for my first wedding which was very generous I think. They gave £400 towards my second wedding too (which we bought a painting with) which was nice and unexpected.
They earned well and spent a lot on themselves and I don't think it really occurred to them or me to expect any different. They were both poor growing up and had no help from their parents so thought once you were 16 you should pretty much be on your own - I had to pay my share of holidays from 16yo if I wanted to join them. They charged me 50% income for board from 18 too.
DH's parents were wealthy and I was surprised when I met him that he had 100% mortgage and they'd not helped him to buy (But they had paid for everything for his BA and MA and helped when he went travelling for a year). Similarly they had been very poor and it just would never have occurred to them to give a large sum towards a house.
Both DH and I had 100% mortgages when we met and then pooled our money and bought a bigger place when we had kids. But then mil died and DH inherited a substantial amount, so we bought a bigger place with a garden. So I suppose the answer is we have had a lot but it was mainly in the way of inheritance rather than large deposit gifts.
Neither sets of parents had paid into any private pensions so now we are looking at financially supporting my parents as they don't have enough with their state pension. This is instead of saving or paying into any pension for us! Again it hadn't occurred to them that they'd need it.
My parents do look after the children and help out if I have appointments etc, but would never do it as an arrangement so I could work. Its very much so they can enjoy the children rather than be childcare. Which I understand and never expected them to be any different.