-Late Mr. Robert purchased 125 sqm land in 1969 from Mr. Xyz.
-He transferred this land to his only one son Peter's name in 1975.
-Peter sold 62.50 land to one of his son David on 16 Feb 2015 (before 3 years and 3 months).
-Mr. Peter died in Dec 2016.
-I have purchased that land from David on 25 Jul 2017 (09 months before) and my brother is staying there with his family.
-Now, David's 06 sisters are saying that this is our Ancestral property and return it otherwise we will file suite against me.
-I have 2 questions
(1) It is Ancestral property?
(2) My sale deed is safe or not?