pitrbhih—along with the residents of Pitrloka SB 1.15.49
pitrbhih—by the Pitas SB 4.6.8
pitrbhih—by the forefathers, the father and grandfather SB 4.8.37
pitrbhih—by forefathers SB 4.12.26
pitrbhih—with your forefathers SB 7.10.18
Can't find any compound Sanskrit words containing pitrbhih.