Although the sons of the lord of the domain were usually born and raised in the Edo residence, since he was born in a branch family, Toyoshige was born and raised in the castle town of the Kochi-jo Castle.
通常、藩主の子は江戸屋敷で生まれ育つが、豊信は分家の出であったため高知城下で生まれ育った。