Summer Rose

Summer Rose is Ruby Rose's deceased mother, and is first mentioned in the "Red" Trailer, with what appears to be her gravestone being shown on the Cliffside Altar.

According to Monty Oum, Yang Xiao Long is Ruby's half-sister, thus making Summer Yang's stepmother. Summer died at some point prior to the start of the series and, in "Burning the Candle," it is implied she died during her final mission.

According to Yang, Summer was a highly skilled Huntress. Yang also reveals that she was part of a team with Qrow, Taiyang Xiao Long, and Yang's Mother. Yang describes Summer as a 'Super-Mom' and still fondly remembers her cookies.

Trivia

 * She is the first parent to be mentioned by name, and the first character to be apparently deceased (chronologically).
 * Her name derives from the poem The Last Rose of Summer by Thomas Moore, as evidenced by the epitaph on her gravestone.
 * The discovery of her death by Ruby is told in the first set of lyrics in "Red Like Roses Part II," and is deceptively morbid.
 * Likewise, the second verse of the song is told from Summer's perspective, stating her regret for having left her daughter behind.
 * The second verse of the song also appears to allude to the idea that Summer Rose didn't want Ruby to become a huntress:
 * "But baby please don't do what I did. I don't want you to waste your life in vain."