Obc status

I, at the age 28 years; joined Govt. of India service as group-C employee and entered in Group-A service at the age of 44 years. I do not have any other source of income. My wife is a home maker. I belongs to a caste which is listed in OBC Central/ state list. I want to know, which criteria will decide my son's Creamy Layer status? 1. My Status 2. My Salary 3. Both 4. Anything else