Verified answer

If it is an alleged Yahoo Answers violation, you can follow their appeals process. The Abuse Report could have been a mistake or a malicious prank.

If it is alleged that your account is sending spam, treat it as plausible. Change your password. Check for tampering with your alternate email contact address, your signature, or your vacation response. Also do not click links in suspicious emails. Those can run malicious scripts that can tell logged in webmail to send spam.

If the email is asking you to send your password or to go to a link to log in, it is phishing spam. Don't do it.

I think you're meant to have an official "family account" not just explain the situation on your answers profile. I've had a question deleted (but that's all) when I let my daughter use my account to ask a question. (Violation of TOS (she was under 13) not "posing as a minor")

Reply to that email stating your question.

Here they cannot answer this question.