But if you put it along with the comment in the Corbomite Maneuver that's 2 instances where Spock's family is referred to in past tense.
There was also an episode(Conscience of the King) where there's a reference to Vulcan's being a conquered race. Then it was disputed in another episode in season 2. TOS did a much better job with things in continuity compared to shows in that era. But it wasn't perfect.
There was also an episode(Conscience of the King) where there's a reference to Vulcan's being a conquered race. Then it was disputed in another episode in season 2. TOS did a much better job with things in continuity compared to shows in that era. But it wasn't perfect.