One more question about PR and my 4 yr old son.

[johnops]

I have read the threads on this topic but still confused. I have just had my PR application accepted but thinking about what to do as unsure of my 4 yr old son's responsibility.

I am US citizen and my 4 yr old son is US citizen (born in US). My question is: IF I accept PR for me and my son, then for some reason I leave Singapore in the next 3-5 years (and in the process revoke out PR status) Will my son still need to do NS? Any comment would be much appreciated.