بسم الله الرحمن الرحيم
It should be noted that according to Shariah, it is not lawful to make a will for one’s legal heirs. It is recorded in one Hadith: لا وصية لوارث . (will made for an heir is invalid)
The second point is that until you are alive you are sole owner of all your property and none will have share of inheritance in it. Yes, after your death, it shall be distributed among your heirs. Whatsoever a man gives to his children and wife during his lifetime it is hibah (gift). If you want to give something during your lifetime then you may give. You may give one eights share of all your property to your wife and one sixth share to your mother. Whatsoever remains after it, divide it in two equal shares and give 1-1 share to each son. Also give it into their complete possession.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.