PR Chance of approval

No, absolutely not. They want your son for NS (and they want to see that commitment from you) so if you don't apply as a family they will 💯 certain reject your pr application.

I disagree with John above: At that very high salary, your chances are quite good - But ONLY if you apply as a whole family (and thus commit your son to serve the Singapore military). If, in addition, your wife is of Chinese ancestry, you are a shoo-in!

But you should keep in mind that the (for most people) main advantage of becoming PR, meaning the ability to buy a subsidized flat, does not apply to you - high income earners are excluded from the HDB scheme!

Oh, sorry, I just re-read your post and saw this:

Any chance to get PR if i apply alone?

Then John is correct: No chance at all!