Will I able to get any refund. I am very stressed because of this and need to return to all parents?

You're digging your own grave. Your son lied about being 18. You knew about it. You're liable for his conduct.

How do I trademark a video game?

You definitely shouldn't let this stop you from making progress on your project.

Calculate the damages caused to your business/reputation by virtue of her statements; find corroborating evidence/witnesses; and sue her.

What you're talking about is a practice called "Doxing" which is generally against the Terms of Service of most websites. Then again, if what is...

You can sue for damages; or you can sue in "equity" meaning have the Court order possession be restored to you. Proving how your ex hacked it...

Am I responsible for illegal downloads done by my guest in my apartment (using my Wifi)? I got copyright infringement notice.

If what you're saying is true you can show that the device ID; MAC address; even the ports used are not typical to your devices and find a log of...

Can I sue if someone was going to sue me for slander but they slander me right after?

Just because you use legal words doesn't mean you're using the right ones. Start by googling slander and defamation...

I know it was stupid to do but I was sexting someone who I thought was one person but turned out to be another

If they are threatening you in writing you can take that to authorities as blackmail/extortion.

Parents are responsible for liability accrued by their minor children. If you broke the law you broke the law. Do the crime: pay the fine/do the...

Yes it's illegal because the only real purpose it would serve is some sort of wifi phishing. What legitimate reason would you have to waste time...