Lydia Hart is left utterly devastated after learning she is given a harrowing potential diagnosis on Emmerdale next week.
Upon her encounter with Lydia's long-lost sister Beth, Mandy is determined to get to the bottom of the mystery and forces her to explain herself.
Mandy ends up barging into Beth's home and discovers Lydia's mum Agatha, quite clearly alive despite Lydia being told she was dead.
Agatha asks Mandy to take her to see Lydia and Mandy worries whether she has done the right thing.
When Agatha arrives at the Dingles, she admits that she has a lot of explaining to do and Lydia tries her best to face her past.
Agatha insists that she never stopped thinking about Lydia but reveals that Lydia's dad died of Huntington's disease - meaning that there is a likely chance of Lydia having the same thing.
Lydia is shocked and tells Samson, Mandy and Vinny the news, which she is struggling to come to terms with.
Later, Agatha tries desperately to build bridges with her but ends up setting her by referring to her as Jenny.
Lydia was born as Jenny Finn but was placed into Hotten Grange children's home by her mum, who claimed at the time that she was too ill to look after her.
When she was just 15 Lydia became pregnant and gave birth to a stillborn boy, who she buried in the woodland.
Jenny later went missing and changed her name to Lydia Hart.
*Emmerdale airs weekdays at 7pm on ITV, with additional episodes at 8pm on Thursdays
