If my memory is not failing me AGAIN, I think this means you have something else you must accomplish first before his house appears on the map....
Here is an afterthought - if his house was on the map prior to this and it has now disappeared from the map, it sounds like you have a 'game glitch'. In which case you may need to replay from a previous save game to see if it is still gone.
Maybe someone else has another idea.
Love, Betty Lou
I am 'the HAT lady"! and "who loves ya BABY?!"