What makes a SINGAPOREAN?

Or rather, who qualify him or herself as one Singapore?

Is the criteria set at he/she must born to and bred by a Singaporean couple?

It doesn't mean he or she holds the pink IC or the red passport that make them legally, but no morally a Singaporean?

And do we still consider our Singapore-born relatives and friends who took up foreign citizenship due to various reasons that saw they relinquish their pink IC and red passport - Singaporean?

Our forefathers who came to this island from their ancestral land and settled down here - are they called immigrants OR Singaporean?

So who is Singaporean?