When our grandchildren arrived, we loved the fact that our children and their spouses could now celebrate Mothering Sunday (and Father's Day) in their own right. We weren't usually forgotten - flowers, cards, phone calls etc - and have had difficulty impressing on our children that it's lovely to be remembered, but we know they care for us all year round, and that maybe they should not be spending their hard-earned money on us now they have families! Maybe we should be spending ours on them so that they can celebrate!
Ceitdh, you have a wonderful family. Please help them celebrate. You won't be forgotten: it will just be different! They will always remember how much you have done for them, but don't make them feel obliged to do what you want or they will resent it.
What a great question for lots of discussion!!