1 month advance notice required for employee ?

i can report any time less than one month notice period

yes need to one mont notice 

as per the labor law and the contract

Two weeks is standard but it may less or more based on your company policy.

enough to called another to instead him.

the emplees need to submit thier application in advance ,al least one month

yes,so that your immediate supervisor ot whoever you report to know where to begin, what you are leaving that is pending or what you didn't complete is known.

As i am working in Family Business so it is not necessary.

YES, it should be 1 month depending on your company's policy.

Yes, the employee must notify his manager of his resignation from work at least one month in order to be able to bring others depending on the company's policy and most importantly position

Yes, as per company policy as well as to give proper handover to the reliever.