Can they gift their shares of the above to me?
Instead of executing a gift deed, your siblings can jointly execute a registered release deed in your favor relinquishing their rights in the property being transferred to or name. In this registered release deed you may make a mention about the amount being settled to them individually in return as compensation to their relinquished share in the property.
The gift deed cannot be made for consideration.
What other options to I have?
The other options are registered gift deed or family arrangement deed or sale deed.
What is the requirements to carry out this agreement so that there is no confusion or dispute at a later date.
Everyone have to jointly execute the proposed document whichever has been mutually agreed upon by all.
What is the procedure as per the indian law.
After having decided on mutually agreed terms, catch hold of a document write who will able to draft a document/deed as per your desire and get it registered
What would it cost me to get all this done
The cost for the whole process wold depend on the local circumstance which cannot be predicted.
Stamp duty is a state subject and differs from one state o another across the length and breadth of the country.