Yes, Ms.Meenaxi,
I think that our friends have answered the query in a general perspective of a proprietor working in his own establishment along with his employees. It is correct but it cannot confer him the legal status/position of an employee.
Very particularly under the CLRA Act,1970, the terms 'contractor', 'contract labor' and 'principal employer' do not stand in absolute terms but in relation to one another only. For the purpose of licensing of contractor under the Act, the same person cannot be a 'contractor' and a 'contract workman'. In addition, the question of coverage of that contractor cum contract labor under the EPF and ESI Acts or EC Act would also arise. One cannot be a 'contractor' and a 'contract labor' under the CLRA Act,1970.
Therefore, my above negative answer to the query is from such a legal perspective only and not the contractor's stepping into the shoes of anyone of his contract labor for the sake of expediency of the contract work.