Released deed When of the family person is missing.

My father has 6 children's, 4 male and 2 female. Now my father has expired The property is still in his name and it's not divided among us. Few of the property are inherited and few are self acquired by my father. In one of the land which was self acquired by my father i am planning to build a house. all my brothers and sisters have agreed for this and they are ready to transfer it to my name. But the problem is one my sister is missing from 6 months and police complaint has been given. So have been told we cannot divide the propery untill she come or untill 7 years. It has come to our notice that few of brothers are now trying not to give that land in future. Since I have few control now can I get a release deed done from all my brother and sister except from the missing sister for that land. The children of missing sister as ready to sign. Is getting a release deed a got option to secure that land ro myself. Or is there any option to.secure that land as everyone have agreed to give it to me for now. I want this done before they change their mind.