Does your sister have special needs of some sort that necessitates you and your parents supporting her financially? If yes, then my advice may be not relevant. But it seems like her situation is not healthy and you are all impeding her ability to adult. The whole situation sounds very messy and I'm interested in your husband's perspective.
Step 1: Take control of your familys (you, your spouse and your children) finances. That means sell or rent for market value your NYC appartment. If your parents want to support your sister that is their business, but she is not your child or spouse and you don't need to spend $12k+/yr supporting her.
Step 2: Evaluate with your husband what your financial goals are and make a plan. This has nothing to do with your parents or sister. You may want to see a financial advisor to help plan.
Step 3: Determine whether you want to rent or buy your new home. Your husband does not want to live with your parents, so even if you are on the deed to the house you should NOT be living there is you want to stay married.
I would not spend a dime renovating a home I did not own unless my parents or dependent needed the financial help for extenuating circumstances. I would not have an able bodied adult family member living in my home rent free either.
Step 1: Take control of your familys (you, your spouse and your children) finances. That means sell or rent for market value your NYC appartment. If your parents want to support your sister that is their business, but she is not your child or spouse and you don't need to spend $12k+/yr supporting her.
Step 2: Evaluate with your husband what your financial goals are and make a plan. This has nothing to do with your parents or sister. You may want to see a financial advisor to help plan.
Step 3: Determine whether you want to rent or buy your new home. Your husband does not want to live with your parents, so even if you are on the deed to the house you should NOT be living there is you want to stay married.
I would not spend a dime renovating a home I did not own unless my parents or dependent needed the financial help for extenuating circumstances. I would not have an able bodied adult family member living in my home rent free either.