Will issue of ancestral property (not purchased)

Sir, After the partition of India, my grandfather migrated to Delhi and govt. allotted him 12 acres of land for agriculture purpose as per the punjab act (rehabilitation of migrants). My grandfather expires this year. There are 2 daughters and 3 sons of my grandfather and one is expired out of 3 sons (my uncle, chacha). After the expiration my grandmother, The Testator (my grandfather) exexecutes the following wills (all registered in sub registrar office) * 1st WILL in 2006 with the consent of all the three sons in which all the 3 sons were beneficiaries. * 2nd WILL in 2009 without my dad consent at which my dad was not the beneficiary as the others two sons ditched my dad. * 3rd will in 2010 also without my dad consent in which the all the property and its rights give to the youngest son who is alive. So my questions are: 1 - confirm us that is this property cab be categorised into ancestral property or self aquired (purchased) or else what? 2 - is this whatever property (testator's will) can be challenged by us in the high court? (as the property value is more than 2 crores) please please answer above questions and we are requesting that we need a expericed high court advocate. So please reply with your email id. Thanks and am waiting for the answer.....