No, lol. I forgot that too. I can't remember Sam ever having a second of tolerance for Ava.
And yes, Nina was the (adopted) sister of the varnished wood effigy known as Nathan West - his bio-mom was Obrecht, Donna Mills' sister. Stafford's Nina used to constantly call him "Jay" (his first name was James) and fawn over him which drove me nuts. I had a very strong suspicion in 2014-15 that RC had actually intended for both to be stealth Cassadines given the connection he created between Obrecht and Thaao Penghlis' Victor Cassadine, and have Nina and wooden Nathan end up hanging out at Wyndemere and mixing it up with Nikolas and co. Small favors that didn't happen. But anyway I never cared about Nina and Nathan's bond, their family, etc. I do buy Nina caring for Maxie even more since Nathan's death, though.