Now is the time to thank your Mom for all the time, energy and money it took to raise you right! Our daily existence is supposed to prove that it was all worth it, so if that's in any way questionable, you definitely need to send her a nice card. You don't want her wondering why she thought it was a good idea in the first place, do you? No, of course not.
And don't forget Grandma!
Happy Mother's Day Moms!