|After wishing her brother had never been born, Donna wakes up the next morning to discover she's received her wish!
In keeping with the Barclay family's "It's a Wonderful Life" allusions, Donna wishes her brother had never been born and ends up getting her wish. This is similar to the plot of IAWL.
In this episode we hear about a show called "Three's in Charge". Which is probably a take on the show "Three's Company".
In reflection of the above comment, it is probably a mixture of "Three's Company" and "Charles in Charge"