Nicki Minaj's half-sister attended Cardi B's concert, claiming 'sides' don't matter. Minaj and Cardi have been in a bitter feud since 2017, with their rivalry escalating in 2018. The feud continues amid Nicki's support for Trump and Cardi's criticism of the former president. The beef between Cardi B and Nicki Minaj is seemingly never-ending, and now, a sibling has entered the (concert) chat.