Ginny is engaged to Greg (although she’s having an affair with Phillip). Phillip is married to Sheila (but she’s having an affair with Greg, he suspects). Meanwhile, Greg thinks Phillip is Ginny’s father (in truth, he’s Ginny’s boss). Scratching your head? You will be, while laughing your head off, at the classic, human-foibles farce “Relatively Speaking” from Florida Rep.