Hi, I am on j1 visa, first time I file a tax return , I am married and have 2 kids, my wife and one child have ssn, but my other child doesn't so I field my tax return and sent a w7 along with it, do I still have to send a w7with a notarized passport copy to austin Texas?

It depends on your home country.

WHAT is your home country?

Egypt ,

Sorry, but you CANNOT claim either your children or your wife on your non-resident return.

Claiming of dependents on the non-resident return is restricted to residents of Canada, Mexico, India and South Korea.