Sharon (The Big Bang)

Sharon was Amelia Pond's aunt.

Biography
When the Eleventh Doctor met Amelia, Sharon was her guardian. Amelia had lost her mother and father to the crack which erased them from existence, creating an alternate timeline. In this timeline, Sharon had moved with Amelia to Leadworth some time prior to Easter 1996. (DW: The Eleventh Hour).

In another alternate timeline in which all the stars were destroyed in 102 AD, Sharon took Amelia to the National History Museum in 1996. Amelia dragged her around and then ran away to find the Pandorica. After Amelia went into hiding, Aunt Sharon looked for her, but failed.

After the cracks in time were closed by the Doctor, Amy's parents were restored to the timeline and Sharon had never become Amy's guardian. Sharon attended Amy's wedding and witnessed the return of the Doctor on 26th June 2010. (DW: The Big Bang).

At some point Amy dreamt that she was a child in the 1960's and that her Aunt was with her. However, Amy quickly deduced that she wasn't real and eventually disappeared. (DWM: Forever Dreaming)