Aunt

As her parents were lost, Amy Pond was raised by her Aunt Sharon. (TV: The Eleventh Hour, The Big Bang)

The "Katy Manning" Iris often referred to herself as "Aunty Iris". (AUDIO: Iris Wildthyme Speaks...!, et al.)

Tegan Jovanka's Auntie Vanessa was murdered by the Tremas Master. (TV: Logopolis)

Other references

Alongside Uncle and Nephew, Auntie was a servant of House (TV: The Doctor's Wife)

Auntie was the leader of a human colony in the 29th century. (AUDIO: Three's a Crowd)

"Aunty Winnie" was "the most famous children's author in the world". (PROSE: Hello Children, Everywhere)