What movie is about a woman dying of cancer has scene where two kids and mom are dancing being silly in the house?

You're likely thinking of the movie "The Fault in Our Stars" (2014).

The scene you describe is a pivotal one where Hazel (played by Shailene Woodley), her boyfriend Gus (played by Ansel Elgort), and his little sister, Isabel, are having a playful dance party in their living room. This moment is a poignant expression of their love, joy, and the importance of living in the present even amidst the shadow of Hazel's terminal illness.

Let me know if you have any other movie clues! 😊