Cracked timeline (The Church on Ruby Road)
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As stated by the Fifteenth Doctor, the goblins cracked the timeline when they travelled back in time to the night of Ruby Sunday's birth and ate her, erasing her presence from history and adversely affecting the lives of her adoptive mother and grandmother, Carla and Cherry Sunday.
This timeline was soon negated by the Doctor when he followed the goblins and prevented them from harming Ruby, allowing Ruby's life to be restored.
History
Original timeline
In the original timeline, Ruby Sunday was found outside the church on Ruby Road by Carla Sunday on Christmas Eve 2004, who then adopted her. Carla raised Ruby in Manchester for part of her life, before moving to Notting Hill and into the flat belonging to Cherry Sunday, Carla's mother.
On Christmas Eve 2023, Carla took in a newborn named Lulubelle, whose mother couldn't cope with raising a child. The goblins, who fed on coincidence, spotted a chance of coincidence with the similarities between Ruby and Lulubelle, so set about abducting the child so they could feast upon.
Lulubelle was rescued from the goblins by Ruby and the Fifteenth Doctor before it was too late, and so the goblins, not wanting to waste the coincidence, travelled back in time to the night of Ruby's birth. This also appeared to create a large physical crack in the Sundays' home. (TV: The Church on Ruby Road [+]Loading...["The Church on Ruby Road (TV story)"])
Cracked timeline
Subsequently, the erasure of Ruby Sunday from history resulted in the timeline being cracked, and, in her absence, the lives of Carla and Cherry Sunday were adversely altered. However, the Fifteenth Doctor was able to retain his memories of Ruby.
Carla only fostered five children, rather than the thirty-three in the original timeline. She was much more bitter and cold, dismissing the few children she did foster as "brats", resenting Lulubelle for ruining her Christmas which she intended to spend alone. However, she appeared to be subconsciously aware she was missing something, as she teared up when speaking to the Doctor about Ruby.
Cherry also believed they weren't "blessed" with having a child in their lives, when the Doctor asked her about Ruby.