it depends on the county/state how many live with you etc. Call your local Social Services offices to get the paperwork, or check them out online.. most of the paperwork will tell you how much is too much.
It depends on how many are in your family, how much income you have and assets. I know for my family of four, once my husband started making more than $30,000/year they cut us off. We still qualified for the CHIP program for my kids to have coverage. That cut off for us was $44,000/year.