I don't think he's a weak man. He handled it well. Hata akaendelea kunywa chai. If he had raised his voice or hand most probably sahii he would be jobless or worse still on his way to Kampala
Kukunja mkia in this situation would be the best policy. Those are young girls that don't understand the world yet. Thats a very common! Both parents failed to stop it from descending. The mother was playing along...
In that family, communication between the husband and wife has broken down. That's a man who has been worn down! And those braggarts care only about their entitlement to self importance. Who tells them they are entitled to a dad they could humiliate that way?
It's still OK kukunja mkia and not fight. But unakunja nguo zako and move out from such poison!