A brother and sister on Tuesday are taking sibling competition to a new level - specifically the local election level.

Randolph Bracy and LaVon Bracy Davis are running against each other to become the Democratic nominee for a state senate seat in Florida.

And in this sibling rivalry, their mother has taken a side: Lavon Wright Bracy is serving as her daughter's campaign manager, according to her Instagram profile.

There are four contestants altogether in the primary in Orlando, and the victor is expected to win the general election in September. One of the Bracy family's close friends, civil rights activist Geraldine Thompson, held the seat for two decades until she died earlier this year.

Ms Bracy, the siblings' mother, was maid of honour in Thompson's wedding.