1. How to obtain Legal Heir Certificate and if this would suffice the above-said disbursement and property shares?
First apply for legal heirship certificate giving details of all the legal heirs of the deceased and annexing the death certificate of the deceased, before the revenue department, get the certificate after complying the formalities and then proceed with mutation of the records as per family arrangement and mutual agreement among you siblings.
2. As brothers and sister are NRIs, do they need to apply for Legal Heir Certificate separately too?
Any one of you can apply for legal heirship certificate by including everyone's name in he application for the same before the revenue department.
3. If yes, would the procedure for them be different or lengthy from what would be followed by me in order to obtain the same?
Not necessary
4. Shall banks and Tehsildar disburse/distribute the amount/property shares equally post Legal Heir Certificate without any more requirements?
After obtaining the legal heirship certificate, you should apply for the claim accordingly and the other shareholders should authorise you to obtain their share also on their behalf by following the correct legal procedures for each claim including partition
5. Any additional points to remember throughout the process?
An authorisation letter duly notarised by the notary of their respective country in your favor to follow the procedure and procure the necessary relief and claim and also a GPA if possible to transact with the immovable property on their behalf shall be a suggested measure to follow the process properly.
6. As I reside in Mumbai, and that death certificates have been issued by a town's municipal body in Maharashtra, is it required for me to run after a lawyer based in town or even a lawyer based in Mumbai would do?
If you can handle the issue by yourself, you dont need to take the guidance of a lawyer and also not all the lawyers would be acquainted with the procedure and formalities in this regard.