My hubby doesn't even buy into Fathers Day...he hates holidays that he feels are "made up". Mother's Day falls into this catagory as well as Valentines Day.
I knew it going into our relationship, and strangly it works out for us well. I usually get him something very small a super hero T-Shirt and a pair of boxers...I scrapped a page for him last year of the boys and he loved it, but honestly, I love our take on Holidays that can add pressure and take a lot of money out of our budget.
As the boys get older they have been doing some fun stuff for the both of us, but since we don't make a big deal out of it they don't seem to concerned either.
I will of course get my dad a little something, and do something special for my FIL, but it will be low key and probably home made.