Most murders take place like this only. One should find other alternatives instead of going and settling in dangerous environments as your inlaws place. Suppose if they poison you or smother you while you are asleep who is to be blamed? You will die and the kid will be orphan. Your parents will suffer due to mad decision taken by you. I am not saying this will happen, but most murders take place like this only. It appears that your marriage has failed. Failure of marriage is a consequence of your actions only. Try not to blame someone else and risk takiing further by moving into father in laws house.
Settle the m atter amicably by taking divorce and move on. Remember when food is stale you can stuff it down your throat one day because you dont have any other food on one night, but daily nobody should do. Better to find good food and live dignfied life by taking divorce mutually.