Kare-mo [kare-no musuko-ga kabin-o kowasi-te simai-masi-ta koto]-o wabi-te ori-mas-u .
he-also he-GEN son-NOM vase-ACC break-CV MAL-HON-PST COMP-ACC apologizing-CVB PROG.HON-HON-PRS
He is also apologizing for his son having broken the vase.