He talks about how, as a Kennedy, they were brought up to know the facts, discuss, defend and debate how they felt about them, and still love each other. And that he understands how they feel, and still loves them.
He also mentioned that he also has many other members of his family supporting him and working on his campaign.
Thanks. He said something similar when endorsing Trump in regards to having strong differences on certain matters, but similar views concerning the existential issues.