Yes you are eligible for Non creamy layer as your parents are grade 3 I.e class 3 teachers and in case parents are salaried their status maintains not the salary so if both parents are class 3.employees you.will get a non creamy layer status.
The Government of India has evolved the criteria for exclusion of certain socially advanced persons/sections from the benefits of reservation available to OBCs in civil posts and services under the Government of India and this is called the “Creamy Layer criteria”
Who are covered under Creamy layer of OBC Quota
(I) V.V.I.Ps.- President, Vice-President, Judges of the Supreme Court and of the High Courts etc.
(II) Government or PSU employees of Central or State-
(i) parents, either of whom is a Class I officer (direct recruits)
(ii) parents, both of whom are Class II officers (direct recruits)
(iii) parents of whom only the father is a direct Class II officer and he gets into Class I at the age of 40 or earlier.
(III) In military, parents, either of whom is in the rank of Colonel and above.