Tsuneyasu Takeda, a member of one of the 11 former princely houses that were abolished after Japan's defeat in World War II, in 2006 | REUTERS The heads of Japan’s parliament are in the final stages of compiling a report to recommend measures for preventing the number of members of the imperial family from further dwindling, and a key proposal is expected to be the reinstatement of former male royals along the male line through adoption. The size of the imperial family has become smaller over the years. In 1989, when the Showa Era (1926-1989) became the Heisei Era (1989-2019) with the death of Emperor Hirohito, there were 21 royals, but now it’s down to 16, of whom only three males are in the line of succession and five are unmarried women, including Princess Aiko. If all of the princesses become commoners when they get married, the number will drop to 11.…