Gift settlement for my wife!

Sir, I'm having a 1200 Sq ft. Of land, and it's been under construction half way. Due to the price exclation it's been delayed. I'm a father of two major sons. Since, I'm a cancer patient, I afraid I couldn't survive much longer, so in order I'm willing to settle this house propery as a gift to my wife. My question is whether my wife during her lifetime/after her lifetime (If she wishes), 1. Whether my wife could give away the property to my two sons as an Undivided Shares of 600 Sq ft. each (ground floor to younger son and first floor to elder son). 2. Whether both of my sons could sell their propery individually without any difficulty? Thanks in advance, Shanmugam M