How to pursue personal passions?

Last few weeks I have witnessed some situations, which led to some of these questions-

What happens if you are passionate about doing or becoming something in life and that is exactly opposite to your partner or your parents thinking? It becomes easy if one direction is a good and other is bad...but life is not such black or white, sometimes, they both are good in their own way. How do we solve the problem?

Modern way of thinking suggests each and every individual has complete right on what he does and so the younger crowd may end up thinking I am talking nonsense, it actually very simple, his life, his passion gets preference. But is life so isolated, are different lives not connected and affect each other??

Say its a one child family, mother and fathers lives are revolving around that child (Indian reader can easily identify with this), child grows up and becomes an individual of his own. He decides, he wants to become a ascetic (a Sanyasi)...now even his parents regard other ascetics and they have themselves thought this child to respect and revere them, but now...they are disturbed, shocked, hurt and what not beyond any explanation.
The child, now a young man is choosing something they all revered, so that is not bad, but parents want to see their son, progress in material life, get married, have children and all that...and also pray and revere somebody else who is a Sanyasi, swami! I think they are following the common man philosophy, most of us lead that life, so even this is not bad.

Applying modern thinking, the young man should do what he wants to do, well, then the mother is very sad, she gives up eating regularly, falls ill, etc...seeing this the father is also unhappy. With all this their child is also unhappy. Becoming a Sanyasi he should be a source of happiness if not all the Mukthi and all that, which we are however not clear. I think Happiness is to some extent in the direction of Mukthi.

So because parents are unhappy, does he sacrifice his passion (or if passion seems odd with a Sanyasi; dispassion)? Even then the unhappiness flows the opposite direction...from the young man to the parents.

What is the solution for this dead lock?