Buying Property on a "blanket deed of sale"

I apologize for the subject I dont know how to put it exactly:

Here is the scenario:

1) my grand father and his brother owns an empty lot property they inherited from their parents.
2) my grand father and his brother as well as their respective spouses are all dead.The propery owner now of coarse is there respective children.
3) the children of both sides did not decide yet how to divide the property. My uncles and aunts in the side of my grand father's brother dont show interest on the property as of now because they reside outside the country.

Now Im interested to buy the share of my aunts and uncles in my grand fathers brother side. Since its not decided yet how they are going to divide the property is it possible to have a deed of sale indicating they are selling whatever interest they have on the lot without specifying the specific attributes of their share like lot position and size of the lot within the bigger lot? Is there a legal sale of contract like that? Sort of a blanket deed of sale?

Thank you very much in advance!

Yes, it's possible. Since the property is undivided, the specific portion/location of their share cannot be identified. Ask a reputable lawyer to prepare the document to ensure that the same is prepared correctly. But, ask your aunts and uncles first if they are willing to sell their shares to you. They must all sign the document and must be here in the Philippines for notarization. If they are residing abroad, they can execute a Special Power of Attorney (SPA) in their respective countries of residence and have the SPA authenticated at the Philippine Embassy. They must name their representative (i n the Philippines) who will sign the document on their behalf.

Regards,

Atty. Katrina