I though it may have been an Outer Limits episode, but I couldn't find it there, this seems to low key for Outer Limits anyhow, maybe more like a Disney type..? Watched it when I was really young, basically, it's based around a teenage kid, in love with a girl, his father is some sort of inventor, and not very good as I remember.
At some point the kid finds out he and his family are all Aliens, and they have to go back to their homeworld, which makes the kid sad as he likes an Earth girl. I can't remember why they had to leave, I think the government asked them to leave, but it didn't seemed forced, or aggressive.
They boarded a futuristic looking plane, and on the plane the kid discovers the girl he was in love with is also an Alien and on the plane/shuttle/rocket with him, and I remember the parents looking at each other and smiled.
I also remember the father sitting on the plane/shuttle/rocket reading the news paper waiting for the plane/shuttle/rocket to take off.
I also remember the mother consoling the kid, and saying he could get a space scooter, and go to some moon, and the kids was stunned, and said something like "You won't even let me get a motorcycle here"
Time period I would say mid-late 80's possibly maybe early 90's.