Mrs Brown's Boys Happy Birthday Sister 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 cards says "Sister birthdays are the Perfect Time ... To Tell You How Wonderful You Are ... And A Perfect Time To Get Feckin' DRUNK! HAPPY BIRTHDAY!" Not forgetting lots of space to write your own personal message.