3 out of 3 this year!

My three children are all in their twenties now and live in the UK. I often wonder if I confused them when I went to live in Begium where Mothering Sunday is May 11th this year, and then the USA where it is also May 11th, and now France where it is celebrated on May 25th. Could that be the reason I hardly ever get three cards on the same day?
This year I'm happy to have 3/3 and won't expect another on French Mothering Sunday!