He must know about some of them, at least, since they are noble. Elven ladies usually know they are pregnant right away, so unless they're sleeping with multiple guys in the same few days, they know who the father is. But in his culture he plays no particular role in their lives, and they play no particular role in his.

So because he broke one rule he has to break all of them?

Devin, you might want to reread some of the Tashnu chapters then. I don't think I have portrayed Nush as someone who doesn't care what people think -- quite the contrary.

Already in the Prologue little Vash said:

Though the tallest and oldest, Tashnu was also the most timid.

And in all three of "Vash thinks like an elf", "Vash confides", and "Vash regrets", Tashnu's role has been primarily to freak out at various suggetions of rule-breaking and crime, while his brother Shosudin totally ignores him and Vash throws an emo fit.

Tashnu's one big crime is keeping Nina around, but that has to be eating him up inside. His own friends and family don't approve of that. Even if he loves her, it can't be a healthy sort of love. Tashnu is not a rebel -- unlike Shus, who breaks rules without breaking a sweat.