Please tell me about a lodging in Unazuki Onsen that has a family bath that is recommended for traveling with children.

I'd like to go to Unazuki Onsen with family of four during spring break. I have two small elementary school-aged children, so I'd like to stay two nights at an inn that has a family bath or a private bath. Please tell me about an hot spring with breakfast and dinner included. I'd like an inn with a parking lot because I'll be going by car.