You will not really know all of your answers until you contact an attorney in your area. Many states will look at what you have acquired together since the marriage. The financial investment that you made into the home to improve it and all other monies need to be remembered. A suggestion is to get a notebook, write down every step of the process that you as a couple did to refurbish the home and where the money came from. This will help with remembering. All receipts that you have will also help. It was his family home before the marriage but has been used and shared in the marriage. You will need to look into your state laws but this probably will remain his. The investing is what you will want to look at for yourself.
Your daughter needs an opportunity to express her fears and concerns but as a new to be single mom, at 15 she can learn to help you with the daily chores. This will help you and also help with her maturity.