1) Can my mother write property which is self acquired by B Father to anyone of my brother or sister without consent of other family members? - if she wished to give property yo anyone, then She can give only her share from the undivided property. Not more than that.
suppose it happens already what action can i take?- If she has given whole property to anyone then the other legal heirs can ask for his or her share. Firstly mutually, if no remedy then try alternative dispute resolution, still no remedy then file a case before the Court.
2) i am staying in Andhra pradesh . Can Mandal Revenue officer issue legal heir certificate based on enquiry and other proofs like family photos, videos ,wedding card. where b father name is mentioned .- "You can obtain a Succession Certificate through your Taluk / Thasildhar or through the District Civil Court (please note that a succession certificate is issued by a civil court to the legal heirs of a deceased person).
3) Can i go for gazette at this age (45) being a govt.employee ? - A gazette is an official journal, a newspaper of record, or simply a newspaper. If you wish then you can go for gazette.
4) Can i file a partition suit without going for gazette ? if yes, How i can prove my identity as son of B father? and i have no photo copy of property documents also? - first, you have to prove that you ate the legal heir of your biological father, then you have to show that you have not got your share after the death of your father who had died intestate. For such reason you are now before the Court to get remedy.