time limit for will???

In my knowledge there is no requirement for doctor certificate, by examining the witness it will be proved, registration is not compulsory, and if the property is self aquired of ur father there no share to his sister if it is ancestral property there is shere to his sister. the will which was lastly written will be valid one 

Doctors certificate is now necessary since afterwards people claim that the person was of unsoound mind. But since you have regestered it so no problem., it is perfectly legal and enforcable from the day it was executed as per terms stated in the will.

Doctor's certificate is never a necessity while executing a wiil. The legal heir can always challenge the will on the ground of physical and mental fitness of the testator. and Doctor's certificate would be of no help.

The application for probate can be made at time after the death of the testator and it is mandatory to give effect of the directions of the will.

A WILL can be get probated after three years.

doctors certificate is not  necessary .u have to ewxamine at least one attesting witness in the court in support of will

Will is valid, no need of registration but since this is a registered will, it is valid in the eyes of law. No need of doctor's certificate. It has to be probated to prove the authenticity and execution of the Will. Probate has to be filed within three years after the demise of the executant. But under special circumstances to be explained, to the satisfaction of the Court, the delay can be, got condoned.