Hi
1) Since both the brothers are the claimants of the properties bequeathed to you by your father, the ideal options (in terms of savings in stamp duty and registration charges) would have been to
a) Execution of family partition deed or
b) Execution of a gift deed
2) However since you are planning to pay your brother the market rate for the property and that the words such as Partition,Settlement, Gift, Will and Trust have different legal meanings and connotations, the best legal option will be for both the brothers to execute a registered settlement deed conveyancing the whole of the building(ground and first floor) to you (younger brother) and with the elder brother receiving consideration in lieu of his share (first floor) of the property.
3) The Word Settlement also means that there are no further claims from any other legal heirs(including grand sons) and that the property is settled as absolute property once for all in your name and you alone will become the sole owner of the property. Even your children cannot claim it as ancestral property.
4) However at the time of assessment of stamp duty and registration fees, please ensure to obtain fair market value from sub-registrar office for both ground floor and first floor separately and you can choose to pay the stamp duty and registration fees based on the lowest market value of the property(either the ground or the first floor).
5) example: Assuming you are paying your brother Rs20Lakhs towards his share and fair market value of ground floor is 10 lakhs and first floor is only 5 lakhs , you are liable to pay stamp duty and registration charges for 5 lakhs only.
Hope this information is useful.