Nicky has two older siblings who are both 8-10+ years older than him, still human and part of the hunting family. They don't know that their dad let Nicky run, but he's grown up to be a picture of their mom, so he'd be easily recognisable. Plus he kept their surname... I'd love for them to appear in his life, perhaps they've become disillusioned with the hunt or perhaps meeting their baby brother again helps... or not!
The Acostas were part of a really reclusive hunting community who believed in raising their own to avoid outside influences but totally open to how that might have changed since Nicky was run out!