Mrs Brown's Boys Happy Birthday Mum Card Mrs Brown's Boys has proved a worldwide smash and only goes to show when the times get tough, the tough get laughing. This is a certainty with the Mrs Brown character played by Brendan O'Carroll. The card says "Happy birthday to the best MUM in the world you're simply AMAZING! Wishing you a feckin' WONDERFUL Birthday!"Not forgetting lots of space to write your own personal message.