Ok, I probably am. I don't even know why i care or am surprised.
Last year, DS got his birthday card and a voucher 3 months after his birthday, when she passed it to MIL to give to us, even though we live closer to her than MIL does, but she couldn't be bothered to come and put it through our door and said she wouldn't put a voucher in the post. She was invited to DS's party but didn't bother to let us know. MIL told us she had had a text to say SIL was busy (her excuse for everything, she doesn't have children or much of a social life so no idea how she is busy all the time).
Only time SIL sees DS is at xmas at mutual family and even then she takes no notice of him. I don't think she even said hello to him last year.
DH went to MILs last night to pick up DS's present. SILs xmas card was in the bag, as was DS's birthday card (birthday at end of January). I know I should be grateful that she has at least got a card and voucher for him, but this means that yet again she isn't actually going to bother to see him. We are going to ILs 2 days after xmas so why she couldn't give it to us then, I don't know.
Only time she gets in touch is a couple times a year when she is going on holiday and wants DH to feed her cats if MIL is away as well. Of course DH does it.
I know I shouldn't care, but it bugs me. Hoping that my brother is going to marry his GF, she will make a great SIL!