To build or not to build

I am getting so sick of saying that things have been crazy but that is the only word that makes any sense. My dad is out of the hospital and we are trying to convince him to move in here but it is becoming a hard sell. We had a contractor come and give us an estimate of adding onto our house. It was a lot more then we had expected it would be. We would have to sell his house and even then it would just barely cover the cost. I don't understand how adding onto a house can cost just as much as the house itself. It is cray. So for now I am driving back and forth to his house three times a day and he is becoming more and more demanding. It is almost like he has become the kid and I am now the adult. It is starting to wear me down, but what else can I do.