Everyone in my family drives, nobody in DPs family drives.
Therefore it was my parents responsibility to drive DP to and from the hospital when I was in for a c section.
MIL had come to see DS once when he was a day old because her friend drove her.
FIL only saw him at 2 weeks old because me and DP got a bus when I'd had a major operation only 2 weeks before and travelled a long way. God knows when he'd have seen him if not!!! 
Literally every time they see him is when I drive him through. Every single time.
Not once have they got the bus to come see him!
MIL has severe depression and low confidence so I kind of excuse her but there's no reason her and FIL couldn't get the bus together.
My parents have driven me to see DP before we lived together several times when my car broke but FIL brought DP here once and charged him a tenner! (Back when he had a car)
AIBU to be sick of this? I don't feel like it's my responsibility for them to see their grandson if they're not trying.
They wouldn't even be seeing him over Christmas if it wasn't for me yet again and now my Christmas Day is going to be shit because I've got to take DS to see them
I wanted to relax and enjoy the day!
I wasn't even going to be able to because my insurance was meant to run out on the 18th but DP pushed for me to renew it 