A historical source of the Shimazu clan says that Hirokoto's wife was the younger sister (called Tango no tsubone) of Yoshikazu HIKI, but this is not so sure because there exists no other evidence about it.
妻は比企能員妹（丹後局）とされるが、島津氏の史料にしか出てこない話であり疑問もある。