"I have a separate house of our own with my mothers name as first name, mine second and my wifes name as last..." MEANS YOUR WIFE IS ALSO A PARTNER IN SAID HOUSE BUT FOR HOW MUCH SHARE IT MUST BE DEFINED IN SALE DEED. doesn't matter who is placed on number one and who is on last.
if contribution towards payment of money to the seller is mentioned then look who made how much payment but NO PAYMENT doesn't mean she is not owner.
if you provide copy of sale deed experts will definitely contribute more to your concern.
"My wife is from a posh locality from South Mumbai and we were in suburbs... " do you want to say she is much richer then you, if yes, then how can we say she married you for money and comfort. i disagree. also pls mention the current location of house, whether in posh area or in suburbs?
"We had to finally give in since me and my parents didnt have the energy to flight court cases and finally the house was sold "
from your concerns for little soul (your son) and your parents' thought for selling house, i advise you to arrange a mediation at some place with the help of extreme near and dears of family or at the mediation centre at nearest family court and try to calm down the things and avoid courts as none (you and parents) have energy to fight.
if you think you have energy and able to fight then engage a prudent lawyer and start FIGHTING.
Brave concept :
"Do or die"
Practical concept :
"Do before you die"
Winner's concept :
"Don't die, until you Do it!"
Choose your Concept