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Now that their parents are back together, the Craig girls think life is going to be easy. It is, until Kay falls in love with Joan's fiance! Complications arise when youngest sister Penny tries to find Joan a new boyfriend so that Kay and Richard can be together.

How to Watch Three Smart Girls Grow Up Legally and Safely

If you want to stream Three Smart Girls Grow Up through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Three Smart Girls Grow Up films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.