Property dispute in joint family

MY MOTHER BUILT THREE HOUSES i.e., 1 house in (2003) on the first floor of house built by my father 35 years ago (1982)in 30 x 40 site. My mother built another 2 houses (2008) in a different location in 30x30 site. Now mother wants to bulid 2 houses by demolishing the old house built in 1982 and 2003. and she wants to settle her property among her 4 sons(1 house to each son) But my wife wants to file a case on my mother stopping the construction in the site measuring 30x40. Her reasons are 1. There will unequal distribution among four sons. 2.(This is not a cake or apple to cut and distribute equally) My wife who is also a ADVOCATE is not listening to me. 3. The site is in my fathers name. but these 35 years my mother worked hard to build the houses. My wife's challenge is that the property is not self acquired by my mother. On these issues my wife is filing a case on my innocent mother against my wish. 1.Can my wife file a case in the name of my minor son, for equal distribution of property (which is practically not possible)? 2. will the claim of my wife stand?. 3.Though the site was purchased by my father 35 years ago, does my mother have full right over the houses that she built ? 4. Can I stop my advocate wife from filling a case against my poor mother (senior citizen)? Please answer my quaries as my family life is in doldrums. Dr Ramesh.G