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                   208062 Points
                   Joined July 2016
                
               
			  
			  
             
            
             " parents are working in MOTELS.      and they are getting their salary after tax deducting."
This is just I wanted you to re-collect.
So, that is the income of parents, which is already tax paid in US.
That money when you send though bank transfers in India to your son's account, it is tax-free gift to your son.
He can show that amount under exempted income while filling  his ITR. No tax liability will arise on such declaration.
Slowly and steadily, ( may be amount invested in FD or MF etc.) it will accumulate to sizable capital, when he can invest it in house property.
All the best.