He needs to seek for loans and investment for his "business"

By no means should he use your earning for his uncertain business venture. Salary money, be it from any member of the family, should be used to support the family.

I can sense that your marriage and family are at risk. He should find a local job. There are jobs for him if he really looks. At the same time, please show your support and care of him by providing ecouragement and warm and affectionate gestures.

Family are meant to stay together.