Essek approaching Vox Machina, heroes of legend. They don't know who he is. Even if they did know he was Essek and not Seth, they still wouldn't know why he needs to know that the Nein are safe. They don't know they're his family, that one of them is his partner. I'm fond of them, is all he can say.
He introduces them to his brother. His sweet baby brother, the only member of his blood family he truly loves. Verin, who's going off into hell (just like their father did) - but maybe, if these heroes know him, they might help him, they might protect him. Verin is far from the Beacons here; he has no second chance if he goes down.
Essek who once said, 'I haven't cared about anyone for the century I've been alive.' Essek, now aching with love, so much that he'll grasp at anything that could reassure him that his family are safe. Essek, having to let them all go: friends, brother, Caleb.
It was so much easier, back when he didn't care.
(He still wouldn't change a thing.)