Never used to be all that bothered about Mothers Day. Until I got nothing, and then I'd be all like: ONE DAY OF THE YEAR!! $^*"!&%*%^"*!(!(&$&$ !)*$%%^&
Mr. flis reminds the kids, then they remind him they have no money
So he takes them shopping. Which is nice for them because they all go for coffee and cake and hang out, and nice for me because, y'know, presents. Last year they brought me breakfast in bed too, which is always a winner.
I think getting babies to paint a picture or scribble in a card is quite a nice way to get them involved when they're too young to do much else. Maybe take them to one of those beauty shops with the pick n mix section and get them to pick out bath bombs or whatever else. Then, when it's hideous and stinky, you can say the kid picked them and it'll be all good!