Question

click to fix any capitalization errors below. click \submit answer\ if there are none.
my sister told dad that she wanted to join capn cuttlefishs jazz band.

Explanation:

In the sentence, "dad" is a proper noun (a specific person, the father of the speaker) and should be capitalized. The rest of the capitalization is correct: "My" starts the sentence, "Cap'n Cuttlefish's" is a proper noun (name of a band or entity), and "jazz band" is lowercase as it's a common noun phrase here. So we need to capitalize "dad" to "Dad".

Answer:

My sister told Dad that she wanted to join Cap'n Cuttlefish's jazz band.