Note 8 — PART I
Z. Tamotsu Iwado translation
When the succession of a family line was considered paramount, no parents would agree to their heir or heiress marrying out of their family. The eldest son succeeded to the family name and estate. In case of a daughter being the only one to succeed, a man was chosen to marry her and take her family name, so that it would not pass out for the absence of a male child.