When it's time to celebrate the twins' birthday, these party theme ideas promise a double dose of cuteness! 1. Tea for Two. Whether you want to have a vintage tea party, complete with an elegant table, or host a large backyard picnic party where sweet iced tea is your favorite drink, the Tea for Two themes is a fun way to celebrate. your children's birthday Twins. Serve tea sandwiches to feed your guests, then play some of these tea sets to entertain them. Finish off with your favorite…