BBC2 is to make a full series of The Other One, following a successful pilot about what happens when you discover your dead Dad has a secret family and you now have a brand new sister.

Cathy’s dad just died. Colin was the most caring, generous and funny man you’d ever meet. He was a brilliant husband and father, and now he’s bloody died. Kicking the bucket was the most selfish thing he ever did.

But Colin had a massive secret. He had a mistress; which is weird because people with a subscription to ‘Which?’ magazine aren’t usually risk-takers. And not only that, Colin had another daughter with this woman – born exactly a week after Cathy. To cover his tracks Colin decided to call both daughters Catherine, so as to reduce confusion and getting caught (you know, like how married men buy their lover their wives’ perfume – but way worse). His other family - Marilyn and Cat - live 13 miles away in a neighbouring town.

Neither Cathy nor Cat were aware the other existed until Colin’s funeral. And this is where everything kicks off – the Cat is well and truly out of the bag.

The Other One stars Siobhan Finneran (Downton Abbey, Happy Valley), Rebecca Front (The Thick of It, War and Peace), Ellie White (Inside No 9, The Windsors), Lauren Socha (Misfits, Catastrophe) and Amit Shah (Stag, W1A)

Shane Allen, Controller of Comedy Commissioning, says: “The pilot landed fully formed with a powerhouse of female comedy talent established and new. Holly’s writing is incredibly impressive as she brings new layers, nuance and depth to the knockout original concept.”

Created by Holly Walsh (Motherland, Psychobitches, Dead Boss), written by Holly Walsh and Pippa Brown, Produced by Pippa Brown (Psychobitches, Bad Education, Bounty Hunters), the Executive Producers are Holly Walsh and Ben Cavey for Cave Bear Productions. Commissioned by Patrick Holland and Shane Allen, the Commissioning Editor for the BBC is Alex Moody.