Over a dozen members of Robert F. Kennedy Jr.'s family, including six of his siblings, are endorsing President Biden in Philadelphia Thursday even as he makes his own bid for Biden’s job as an independent candidate.

Kennedy’s sister, Kerry Kennedy, is expected to praise Mr. Biden as a leader in the mold of her father, Robert F. Kennedy, who “stood for equal justice, human rights and freedom from want and fear — just as President Biden does today,” according to excerpts of her remarks released by the Biden campaign.

Her father served as attorney general in John F. Kennedy’s administration and was running for president himself when he was assassinated in 1968.

Speaking for the family members who are endorsing Mr. Biden, Kerry Kennedy will also have harsh words for presumptive Republican nominee and former President Donald Trump.