There aren't nearly as many Mother's Day postcards as I thought there would be, and I'm not sure if this is actually one or not. However, it looks to me to be a "perfect" picture of a family on the day moms are honored. There she is with curlers in her hair receiving breakfast in bed along with flowers, a gift and big smiles from her loving family. Looks like Mother's Day to me!
Either mother or father's sister is sending the postcard to her niece from Stockholm - a long, long way from South Dakota. Can't make out the year on the postmark, but it was some time ago.