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Birdie Thompson is the mother of Derwood Thompson, who is a consultant obstetrician at Holby City Hospital.
Birdie is first seen at the venue of her son, Derwood's wedding, she is seen having an asthma attack (which turned out to be fake) with Derwood worried and wanting to get her to hospital, until Mo finds he inhaler in her bag. She is later seen chatting to consultant cardiothoracic surgeon Mo.
Mo later tells her that Inga is not pregnant, which Birdie soon announces to everyone. She is later delighted when Mo gives birth, Birdie finds out that Mo is having Derwood's baby. Then she started asking questions as to when they were together and she later kisses Henrik.