Oh dear, Marilynne. I was going to say that some people are just thoughtless or forgetful and some just don't appreciate how important birthdays are to some of us. But you seem to have been hit by a perfect storm of thoughtlessness and forgetfulness on your special day. I'd be annoyed and hurt as well.
But at least you got some lovely Mother's Day flowers, and your youngest can't help missing the actual day and may have something special for you when you see her, so it's not all bad. Treat yourself to something special or something you've always wanted, and I hope the family come up trumps in the end. Happy belated 70th to you. 