Well I'm assuming you are moving in with him, so I think the first thing that you have to establish is your goals. And if your goals are to stay there till you earn enough for a house, make sure you break down all the necessary things you will need to obtain that goal. Such as, what type of income you will need to be making to comfortably live in your own house, how much you will need to save up to purchase a house, calculate the expenses that you will be having while living in the parents house, and finally set or create a date that you will be moving out and into your own house.
Once you get that out of the way, you probably want to work your budget and finances to help aid you in obtaining your goal. So, divide your income into money for living expenses, saving, and entertainment.
The important things is to determine how much you would need to save every month to get your house, the time it will take you to accomplish getting a house, and dividing up your income accordingly. Once you done all that you will be out of the parents house soon enough and they will thank you for having a determined and detailed plan. Hope that helped