이사온은 외동딸을 두어 사위인 신명화에게 물려 주었고, 신명화와 이씨부인은 딸만 5명을 두었는데 둘째 딸이 사임당 신씨다.
Lee Sa-on had an only daughter, so he handed it over to his son-in-law Shin Myung-hwa, and Shin Myung-hwa and Mrs. Lee had only five daughters, and the second daughter was Shin Saimdang.