<p>In the fourth series, Susan is looking forward to the birth of her first grandchild, but dreading being a grandmother. Nick is getting fed up with living in his ghastly flat and trying to think of a way to move back into the family home. The gap between Michael&#39;s IQ and the rest of the family&#39;s seems to be increasing, but so is his libido. And Abi is still Abi, only more so! As for perennially put-upon Ben, what with a new arrival causing chaos in the surgery, being forced to take tango lessons and being officially declared dead, life is just one long major-league cirsis.</p>