SPOCK: It was most kind of you to make this effort.
SAREK: It was not an effort. You are my son. ...Besides, I am most impressed with your performance in this crisis.
SPOCK: Most kind.
SAREK: As I recall, I opposed your enlistment in Starfleet. ...It is possible that judgment was incorrect. Your associates are people of good character.
SPOCK: They are my friends.
SAREK: Yes, of course. ...Do you have a message for your mother?
SPOCK: Yes. Tell her ...I feel fine. Live long and prosper, father.
SAREK: Live long and prosper, my son.
- from STAR TREK IV: THE VOYAGE HOME
STAR TREK has always been about family. In the largest sense, humanity is a family. We are, in every measurable way possible, related to one another as a species. Throughout the series, one of Star Trek's goals was to remind us that we are family. It reminds us that family members can disagree from time to time, but are still connected by family bonds large and small all the same.