Akira Okura

The youngest son at 12 years-old, Akira is extremely intelligent and has no interest in the family inheritance because he makes plenty of money via the stock market. He often acts more mature than his older brothers, but he always falls asleep at exactly nine P.M., no matter what he is doing. At age five he was abandoned by his mother and nearly starved to death on his own. He is encouraged in a letter from Shinzo to forgive his mother, and tries to find her. He is the only one of the six sons who actually feels Chisato is his mother, as proven by his shock upon learning that she was never actually married to Shinzo. http://en.wikipedia.org/wiki/Atashinchi_no_Danshi