I'm doing this all from a memory that's 34 years old, so I may make some mistakes. What I remember about this delightfully funny program is:

Hank and his sister are orphans. They don't wish to be put in an orphanage, so Hank uses makeup and disguises to fool the authorities into believing that they are being cared for by an adult. Hank's scheme snow balls as he is forced to lie and pretend to be all sorts of people in order to keep the charade going without being caught. All the while, Hank is trying to get himself a good education (pretending to be someone he's not) so that he can better support his sister and remain independent.

I don't remember how long this series ran, but it is one of the very few that I can recall that actually had a closing episode.

Hank, in a zany and furious attempt to disguise himself as several people at once -- being one person in one place and then switching costumes, personas, and rooms at break-neck speed -- Hank is finally caught and his terrible secret revealed, much to the amazement of all. It is decided that Hank has shown tremendous resourcefulness and is granted his wish to remain in college and preserve his family, under the guardianship of one of the adults who knows him...one of his professors, I think.

As a child, I found this show extremely funny, maybe because I wished my own brothers were as nice as Hank. Oh well....