νεότατο=youngest, newest=πιο καινούργιο
"το πιο καινούριο μέλος" is currently marked as incorrect, general strengthening on web. Apart from efrossyni, I think we've had a couple of native speakers over the past couple of months say that νεος isn't really the best translation of 'new'.
This is a ghost sentence.... :/
Ah, thanks Troll.