Xisuma and Keralis were basically the parents of Hermitcraft. More or less.

Xisuma was the overworked father who did everything to keep the kids safe and out of trouble.

Keralis was the dad who made sure everyone took care of themselves and were doing okay.

Currently, Keralis was scolding (read: lecturing) Xisuma for not taking care of himself again and working himself to exhaustion.