Firstly, he doesn't have a family since he is an orphan. So I don't understand if you have read this book or not. Secondly, in order to get stronger in Danmachi, one needs to have a falna. Since he needed to join a family, why not Hestia since she didn't have any children at the beginning so that he could be alone? I hope you read my book with more attention, and please don't mislead people.