Mostly. The Cinderella theme is generally family - friendly. However, it's always a good idea to check the movie's rating and any reviews. There could be some slightly scary or tense moments for very young or sensitive kids, but overall it should be suitable for a family movie night with children.
Sometimes, it's also available on cable TV channels that show family-friendly movies. Check your local listings. Or you could rent or buy it on digital platforms like iTunes or Google Play.
You could look on Hulu or Disney+. Sometimes they have a wide range of movies like Cinderella Story: Once Upon a Song. Also, check your local cable TV on-demand services.