Her relative KI no Tochihime (who is regarded as a sister of Funamori, although there are various theories on his genealogy) was the mother of the Emperor Konin, so she was also a relative of the Emperor Kanmu.
縁戚の紀橡姫（船守の姉妹とされているが、船守の系譜については諸説ある）は光仁天皇の生母なので、桓武天皇とは親戚ということになる。