I'm looking for an iseaki manga about this guy who gets reincarnated as a nobleman's son and they live in the Countryside. He ends up being really happy about it because he wants to live a quiet slow life. I think he was also secretly really strong but didn't want people to find out. I think he could use earth magic? He made a hideout/house in the forest and a traveling adventure went into his hideout thinking that it was a rest stop for travelers. The adventurer is this really strong guys who ends up being really grateful to the boy for feeding him.
He also had an older sister who is really bossy but good at sword fighting and would regularly beat him up in sword training practice and a younger brother who was sweet but weak. He ends up getting bored so he invents othello which ends up becoming really popular, which draws the attention of some important nobles which are friends of his father. He also was teaching the chef how to make sweets with sugar in it, but they had to be really careful because his mom and sister could smell out sugar whenever it was mentioned.