Sir if terrace rights are not specifically given to you vide partition or the registered deed then in that case it is a common area and undivided area belongs to all three brothers equally.

The Terrace is common ownership so it's belongs to all three brothers.

the intention between the brothers can be taken as - that each brother is entitled to one floor

consequent to the same the terrace rights on each floor will go with the flat 

thus the terrace will be considered as exclusively attached to the flat on each floor i.e. a private terrace

if your uncles are not disputing this then they can become confirming parties in the sale deed between your father and his buyer 

in this sale deed, the flat with the terrace will be sold to the buyer and since your uncles will be confirming parties, this transaction will bind them and they cannot raise any dispute or claim in future

if your uncles are disputing then even your father can claim 1/3rd undivided share in the open area on ground floor and terrace on first floor

Dear Client,

Terrace is common area as there`s no mention in document if specific right vest in your father. Absolute right can be inferred if terrace is under absolute control and use of your father than you can demand, belongs to you.

Terrace  forms part of common area for benefit of all co owners 

you have no ownership rights on terrace 

terrace forms part of common area for benefit of all owners.
no construction can be carried on in terrace without consent of all co owners.

Hello,

If there is no mention of the terrace in any of the document then the same happens to be a common property and can not be sold by you. 

Regards 

The terrace of the building belongs to all the title holders it is not the property of the second floor holder and in case the title is being transferred to any third person the no objection certificate is needed from other to titleholders

Terrace is always common belonging, 

If you have any registered  document in which it mentioned that terrace belong to you then only you claim right on terrace and this allowed only in case of personal property  and no objection by other co owner s 

In case of society terrace is common for all member s of society

According to Section 4 (1A), (iii), (viii), (x) and Section 10(1) of Maharashtra Ownership Flats Act, 1963, the builder/developer has no right to sell the terrace. The builder also does not have the authority to sell the terrace of a building. As per law, all open spaces in a building, including the terrace is a common easement for the benefit of all the members

terrace is of common belonging unless it is specifically mentioned in your agreement for some other arrangement.

If there is no mention about terrace rights conferred on a single owner, then it can be considered as common area belonging to all the owners.