Marcus and Margaret are about to extend a two-bed cottage in Dundrum and share it with Marcus's beloved Aunt May. The cottage was originally owned by Marcus's grandfather who reared May after her parents died when she was very young. In his will, Marcus's grandfather left provision for May to remain in the house for the rest of her life. The house would then pass to Marcus. Now Marcus, Margaret and May have agreed to extend the house and live there together with baby Ahna, 5 months and two-year-old Sean... Cue Dermot running into an array of problems, like the plans for his proposed extension being denied. Designs are drawn up for a two-storey extension, but only the table tennis room gets the green light. The architect is given a stiff challenge to provide enough room for Marcus and Margaret McDonnell to raise their two children and happily co-habit with their aunty.