The Kubo family had migrated to Hokkaido in 1898 because they had to assist in their family 's brick foundry business .
Kubo was the second son if seven children in his family , born to his father Hyotaro Kubo .
The son family had migrated to Hokkaido in 1898 because they had to assist in their family 's brick foundry business .
Kubo was the second son if seven children in his family , born to his father Hyotaro Kubo .