Last night, my brother Answer me a secret.

You are supposed to substitute a word that makes sense for "Answer"?

Last night , my brother gave me an answer to a secret.

That makes some sense, DE. I can think of several words that fill in the blank "Answer". Shared, told, whispered...and perhaps others. I'm still not sure of the problem here, though.

Reed is on the right track. I think it might have been better presented as

Last night, my brother ________ me a secret.

And you can prolly lose the comma.

It seems like you're saying that your brother told you a secret last night. If you would like to share the secret or have any questions related to it, feel free to ask, and I'll do my best to assist you!