@givemeonereason
Christ it seems some of you won't stop until you've got blood. I've already agreed I was being unreasonable. I have said that I'm grateful to them. Without them I'd have lost my house.
What exactly do some of you want? I'm not using not wanting to work as an excuse to be a bitch. I love my in laws dearly. I just want to spend time with my son. I find it bizarre that this concept warranted a
from someone.
Here have another one >>> 
FFS, why hell did you post on a public message forum, asking if you are being unreasonable, if you were going to spit your dummy out when people say things you don't like to hear?!
You ARE being ungrateful, you ARE coming across as very entitled, and you ARE coming across as very precious.
Your PILs are looking after YOUR child FOR FREE! and you are moaning about them being a few minutes late. So you have to go out to work to help financially towards the home and family?! You and millions of others sweetie! 
As a few people have said, if it pisses you off that much, use a bloody childminder, like millions of others have to do, and quit moaning about two lovely generous people who are doing you a massive favour!
(Yeah, it's another one!)
@tinklylittlelaugh
My kids are almost at the age where they are having kids. I can't conceive of treating my daughter like that if I was looking after her kids. Hell I'd be at her house for when she got home. Nothing is more important than the mother child bond.