Sharon (played by Letitia Dean) has had a turbulent few months on EastEnders as her affair with Keanu Taylor (Danny Walters) was exposed, she gave birth to his son Kayden and has had to grieve for the loss of her first child, Dennis Rickman (Bleu Landau). The BBC soap stalwart is also the proud owner of the Queen Vic, which her adoptive parents Angie Watts (Anita Dobson) and Den Watts (Leslie Grantham) ran when the weeknight serial drama first 35 years ago. Over the past three decades, more about the beloved character’s complicated backstory has come to light but now she is firmly back in the spotlight, viewers could discover more from her past. However, will the arrival of a newcomer who looks like a younger version of the landlady hold the answers to a life-changing secret?
Angie and Den adopted their daughter as a teenager and at the time, she had no idea the latter had another son in Dennis Rickman Senior (Nigel Harman).
After he arrived in Walford in 2003, the adoptive brother and sister fell in love, resulting in their marriage and the conception on Dennis Junior.
Following his death in 2005, the beloved character believed her son was the only family she had left in the world as both her parental figures had passed away.
Little did she know her biological father and villain Gavin Sullivan (Paul Nicholas) would be venturing to Walford almost a decade later to turn her world upside down.
Although she might have thought she knew everything about her past, another shock could soon be on the horizon if her long-long sister turns up to cause trouble.
READ MORE: EastEnders spoilers: Beloved couple torn apart by Phil Mitchell?
Gavin was originally introduced as the former lover of stalwart Kathy Beale (Gillian Taylforth) when the latter returned from the dead back in 2015.
Although viewers may have thought this was the villain’s first stint in Walford, it soon transpired he had a history with Sharon’s adoptive parents.
The scheming character revealed he had grown up on the Square and had a child, with his sister Margaret Midhurst (Jan Harvey) having made the arrangement with the former Queen Vic landlords to care for her niece.
As a known criminal, their reunion didn’t go down as smoothly as the soap icon had imagined meeting her birth father would have been like.
This would, therefore, mean Sharon has a sister but with both women likely to be headstrong characters, only more havoc would ensue.
Speaking in an exclusive interview with Express.co.uk, former Coronation Street star Katie McGlynn, 27, teased she could make an appearance in another weeknight serial drama.
The actress said: “You never know. You never know what’s around the corner, do you? I think not right now and I wouldn’t want to rush into it.
“I think I’d want to try other things, but I’d never say never in the future,” she continued before hitting at the type of character she would want to play.
“I don’t think it would work quite well if I played someone who was similar to Sinead,” the soap star added.
“I would want her to be a gritty, naughty, evil person. One with an edge – totally opposite to Sinead,” Katie concluded.
With this in mind and given how any sister of Sharon’s would be a walking, talking wrecking ball, could the actress be lined up to join as the newcomer?
If the Walford icon does have a long-lost sibling, will she be accepting of them, or turn them away in fear they have inherited Gavin’s villainous ways?
EastEnders: Secrets From The Square continues Monday at 8pm on BBC One.