20 Strange Facts That Only Exist In Japan Where Women Lust After Foreign Men!
https://www.youtube.com/watch?v=VwDENOC7M_0
Japanese with small family businesses who don’t have a son will adopt their son in law to continue the family name or they will adopt an unrelated competent adult male to continue their line and business. In this way they are getting around the tendency to nepotism (6:25 min mark).
Similar to the adoption practice of the romans due to the high infant mortality.