EastEnders aired a bombshell recently, as newcomer Frankie Lewis claimed to be the daughter of Mick Carter.
A bigger shock came when Mick learned Frankie's mother was Katy Lewis, his former care worker from when he was in care as a child.
Viewers have since learned that Mick was sexually abused when he was 12 by Katy, and she fled suddenly one day.
Frankie filled in the gaps though, and it appears Katy fell pregnant with Mick's child after the abuse - Frankie - and left.
Now, Frankie trying to track down her father has led to the truth being exposed, but so far only she knows, with Mick currently in denial that it was anything more than a romance.
As the storyline continues, Katy has yet to make an appearance or confirm that Frankie is Mick's child - while she does head to Walford very soon.
There is also some confusion over how old she was then and is now, with Frankie's own age also not revealed.
Mick was 12 at the time and is now around 42 or 43, which means Frankie is around 30 years old.
Her mother was said to be around 20 at the time she abused Mick, making her around 50 now.
But after Frankie revealed she was Mick's daughter, fans of the BBC soap couldn't work out her age gap with her secret siblings.
Now that they know Mick was 12 it would confirm Frankie is his eldest child, and not his son Lee Carter.
Prior to this knowledge though and amid queries over whether Mick had cheated on wife Linda, fans were unsure who the eldest child was, and by how much.
Now it appears that Frankie is the eldest at 29 or 30 years of age, and according to an EastEnders fan site Lee is 27 years old, and 28 next month - while this could be incorrect.
This makes him the second eldest, and his age gap with his secret sibling is around two to three years difference.
Nancy is next, and according to the same page she is barely a year younger than Lee, turning 27 herself this week.
Her birthday was mentioned during the episode on October 13th, confirming this is her date of birth, while a year was not specified.
Their younger brother Johnny is thought to be 24 years old currently, and youngest sibling Ollie Carter is five years old.
Of course some of the ages above may be slightly out, but it has been confirmed Frankie is older than Lee and her siblings.
It's not clear when Mick's family may uncover the truth about who she really is and what happened to him.
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EastEnders airs Mondays at 8.05pm, Tuesdays and Thursdays at 7.35pm and Fridays at 8.30pm on BBC One .
