Am I being unreasonable with baby sitting?

I have a 4 month old son and another son who has just turned 3.

Before having my second baby we were really lucky with baby sitters. I worked 30 hours over 3 days and the childcare was shared between family members. We still had nights out maybe once every month or 2. When my first son was born everyone was asking when they could have him stay overnight and everyone wanted to look after him.

Circumstances have changed and my mum has stage 4 cancer although she's stable just now (I do not expect her to be looking after my kids she so has my nana with dementia and my nephew a lot). But no one has offered to take any of the kids overnight and don't seem to have an interest to. We are lucky during the day my husbands parents often at the weekend take one of the kids for half a day.

My concern is when I go back to work my husbands parents will be looking after them (we think) 2 long days a week. Today was the first day they had them from 14.00-17.30 and when my husband picked them up his mum just went on about how she was so tired and she just wanted to get dinner and go to bed. This worries me that she acted like that over 3.5 hours when they will be looking after them when I go back to work in June.

Also last week we had my 3 year old at a Christmas pantomine and my 4 month old stayed with my mum but rather than keep him all night she had me lift him at 23.00 to take home.

I know some people have no family to help and I am extremely grateful but I just wish the Grandparents were excited to have the kids like some grandparents are.

I think I'm probably just noticing a big difference from going from one child to 2 and am struggling a bit with that. Not many of my friends have kids and still live a carefree life.

I just want to see if other people think I'm being unreasonable. I know I probably am which is why I'm asking this. I know I chose to have kids and I adore them they are my world and I love being at home with them. But still a little part of me misses little things like going to the cinema or out for dinner etc.

Update: thanks for everyone's feedback. I should have said I really don't expect them to look after the kids when we are at work I have said on numerous occasions that we would use a nursery for even one day a week and everyone has said there's no need can manage between family. The problem is I'm a nurse so I work long shifts but my shifts change weekly so its really difficult to arrange like a nursery or childminder when I have no routine to my work. But if I knew they weren't happy I would start looking for a childminder that maybe could be flexible.