My DH niece just graduated from high school and we didn't get invited to the party. His mother told me on the internet when she though she was talking to Kevin (dh) She asked if we were going to sil and then proceeded to give excuses why we weren't invited ie she didn't know our address we've just lived here for 10 years to it was our fault and we must have thrown the invitation out. Kevin doesn't care anymore but I think it is terrible.
(silly us, when we invite 4 to dinner we don't always plan meals that can be extended to include 2 or 3 more!).
! My niece grad h.s. last weekend in Maine. Her parents are divorced but my SIS made sure everyONE was there...YUP, her dad, Dad's mom and all ex-DH's entire family down to the cousins. And of course my entire family. Everyone (for the most part) traveled from out of state and got hotels for the event.
It hurts DH to have his family dislike him because of me (his family doesnt like our age difference im 10 yrs younger than DH), but he says he loves me and hes not willing to give that up 
I'm suprised my dad's family didn't kick up a fuss - my mother came with a ready-made child too (me)!
some people are just like that.