I don't think they did it without his consent. The thing is, investing in a house is one of the first things your parents would ask you to do once you start earning; and considering the amount of influence your parents have on decisions like this in India, he would probably have had to go with their opinion.
>Bonds and stock market are considered as casinos.
Which is correct, except that with bonds and stocks you win on average, while in a casino you lose on average. This equivalence of risk=losing with no regard for expected return is pretty common in many countries. I wonder why that is? A history of scams?