Hello and Thank You for using Just Answer. I am sorry to hear about the problems that you are having with your wife regarding the moving. She probably enjoys the security of living with your parents. But in order for your relationship with your wife to mature and strengthen, you must move. Tell your wife that you want to have your own space with her and your son in your own house. Tell her that if you do not move soon, you might as well sell the house. See how she reacts. It is really selfish that she is not willing to move immediately. What is she afraid of? People are losing their houses everyday. She should feel blessed to have a home to move into. Her parents are still close enough to visit. Maybe marriage counseling is necessary because she just may not be willing to let go of her parents.
Living at your in laws house will be like fighting an uphill battle. Your wife does want to be around her dad who is sick. She also wants to be around her sister. The family unit is back together with the parents and siblings and now grandkids. You are like an outsider. Because you and your wife have so many arguments, she probably could care less if you were living with her or not. She probably sees you like a thorn in her side because she is getting what she needs from her parents and sister.
Marriage counseling will definitely assist you with your problems. You need a neutral third party to listen to your side and your wife's side of the situation and help the both of you reach some compromises. There may be other issues that may also surface that you are unaware of. Several counseling sessions on a weekly or every other week basis will immensely help. Contact your primary physician for a referral. You cannot continue to live in the situation. It is not healthy for your marital relationship nor the bonding between you and your child.
Have a great day. Be strong!!!