Nicki Minaj, Because she has been dominating the charts and giving us hits after hits for almost 2 decades now. She is one of the hardest working people in the entertainment industry along side Beyoncé. Also, MADE lil Wayne give her 5 mil. she has the most streams out female rappers and everything she makes go either gold, platinum, double platinum, or diamond. No one can compare.
Their is your answer the term her would not make any sense in this sentence but their would because asking did either of the sisters bring their umbrella and the term their belongs to both of the sisters