Yes, I think my wife is being unreasonable about this. In fact, the reason I did not discuss with her this time was because we had a similar argument last time when I was "discussing" it with her. Nothing came of it and I really needed to help them out. So I thought, hell with it, I cannot let those who looked after me for so many years, suffer like this just because I cannot convince my wife about it. But then I have come to learn something after being married. That attitude never works. Its a temporary high.
So last night I decided I am going to try to work it out again. I said I will buy these two houses since I have committed to it. But, I will make sure the monthly withdrawal never crosses a limit. if it does, I'll return that extra amount with interest. And I said I will always discuss the issue with her. On her side, she said we should not get into any major investment like this until we have enough (which was funny cos "enough" is never enough!). Of course, if they fall sick or something, we'll help immediately. I agreed to that.
Of course, the above discussion was not without the usual drama. Now things are better. Neither is sure what we have committed to.

. Did we solve something, or did we dig a deeper trench. Only time will tell. Nevertheless, our 2 year old is the happiest cos we are not sulking anymore.
Aahh... married life. What is it that drives people to get married ? I have never been able to figure that one out...
Lastly, thank you ALL for your timely and fantastic responses. I don't even know any of you personally, but you have my utmost gratitude for being there for me when I needed it the most. Thank you !