is it legal in the state of ohio, for a father age 25 to share a bedroom with a 2 year old daughter when he only sees her one day a week, or weekends?

the father is 25, he is the boyfriend of my daughter. when he takes my granddaughter who is 2 she is staying in his one bedroom apartment where i know he only has one bed, i confronted him on this and he told me his land lord told him it was okay, and he also told me he has a small couch in his livingroom that he says he can say he sleeps on in the case of being confronted. my daughter and granddaughter live with me. where they both have there own bedrooms.