1) as per the Central creamy layer criterion II & III dated 08.09.1993 only the sons and daughter of following “government servants” will be treated as creamy-layer.
(i) Parents, either of whom is a Group-A officer. (Direct Recruitment)
(ii) Parents, both of whom are Group-B officers. (Direct Recruitment)
(iii) Parents of whom only the father is a Group-B officer and he gets into Group-A at the age of 40 or earlier.
2) in your case you would fall under OBC NCL as your father at age of 40 was not group A employee
3) for government employees only their position in the office is the criterion for non-creamy layer status. Excluding all Class I employees and direct recruits of Class II cadre, all other govt. servants having income greater than 6 lakhs are still eligible for the OBC non creamy layer certificates