Thinner Than Water. - S2.E4

Nanny & the Girls convince Patrick to accompany them to the Blood Bank so they can all donate some blood. When they arrive home Anna mentions she's type AB, Karen says she is AB as well, Patrick looks at his new donor card & says he's type O. When Georgie arrives Patrick mentions this & Georgie tells him that He can't be their Father if they have a different blood group.! Patrick is worried that his ex-wife Barbara may have been unfaithful to him all those years ago. He searches the attic for Barbara's old Diaries & finds a few names who he thinks might be the Girl's real Father.

He tries to Telephone Barbara in Italy to ask her who these people were but Barbara has just arrived at his front door. Soon after Bill arrives to take Barbara shopping & while they're away Patrick rings two of the names in the book & invites them around for drinks.( for old times sake ) He discovers that they are both type O when Barbara & Bill arrive back from shopping. Patrick tells Bill His prob