Maybe it's just my family, but we don't expect the spouses family to remember birthdays. So for example, my mother's family was not expected to participate in my father's birthday. Let's get real, they didn't marry him my Mom did.... Why would they be expected to celebrate his birthday? (My SIL's family seems to work the same way so I don't think it's just us.)
I send a card for my brother's birthday and gifts for my neice/newphew.
For my birthday, it is actually up to my brother to remember (SIL is not in charge of our family gifts LOL) so some years I get a card and some years I don't.. no biggie.
Luckily for my Dad his wife does assume the responsiblity for cards. He is clueless... I have to remind him the dates for the Grandkids birthdays.
Now I can understand expecting DH's family to remember, but to expect your family to may be asking a bit much.