Since the Tamura family had no daughter other than Aihime, when Aihime married Masamune, the agreement was reached that the Tamura family would adopt the second son of them, but the second son, Munetsuna died young at the age of 16.
田村家には愛姫以外の子女がいなかったため、政宗との結婚の際、二人の次男を田村家の養子に迎えるという話がついていたが、次男の宗綱は16歳で夭折。