Lyn and David, with their baby Martin, return from Canada, causing great excitement to Simon and Oliver. However, the grandfathers have to learn to cope with the baby more than they had anticipated.
Lyn and David are looking for a flat while staying at Simon's house. But Oliver would like them to stay with him too.
The christening is scheduled and Stephanie, Simon's ex, is invited, causing anxiety for both Simon and Oliver.
Simon has to go into hospital but confusion arises.
The house-hunting by Lyn and David reaches a conclusion. It causes Simon and Oliver to think about their own situation.
Lyn and David move to their new flat. Oliver and Simon decide to help them by redecorating the flat.