Two wrongs never make a right.
You don't want your kids growing up in a house where mom and dad never do anything for each other on Mother's or Father's Day or are always fighting about it.
Even though my ex and I were going through a very bitter divorce, I continued to help the kids get or make him gifts for holidays and he never did the same for me. So, one year, for Father's Day, he got nothing. He even tattled on me about it in mediation. I said, "How many years have you not helped the kids do ONE thing for me?"
His response? "I'm not as creative as you. I'm always busy.....", blah, blah, blah.
The mediator told him there was NO excuse for it. None.
So, after that, he started helping the kids. The mediator told him it wasn't about HIM, it was about the kids having the joy of doing something for their mom. And, I admitted that not doing anything for him, even that one time wasn't fair to my kids because he pouted all day and made a scene to them about it.
It's just better to be the bigger person.
I think you should communicate with your husband about how you will both handle Mother's Day and Father's Day for the KIDS' sake. Heck, take them to the dollar store and let them pick out a card and some little thing to wrap up. It's the thought and the process for them that counts. As far as what you actually DO on those days, you each should kind of get to pick. Being divorced, my kids had Mother's Day with me and Father's Day with dad no matter whose actual Sunday it was and it actually worked out great because we got to DO with our kids what we wanted on those days. My son wasn't even two years old when I left my husband. There were plenty of lazy Mother's Days where we just stayed in and watched movies or baked together and had a nice dinner or ordered a pizza so I didn't have to cook. My daughter is 10 years older than my son so I got plenty of breakfasts in bed or flowers picked out of the yard.
I just think you should come to an agreement, and stick to it, as far as what to do for the kids on those holidays and then each agree ahead of time as far as how you want to spend the rest of the day. That way, everyone can be happy.
Just my opinion.