Can the IRS take my federal tax return?

If you don't owe the IRS they can't take you refund. Neithet can the 2 people you owe.

Husband took $41,000 out of 401k without my knowledge Am I liable for the $12000 we now owe in tax debt?

These kinds of issues are stressful, for sure. If the withdrawal was on the tax return you signed then you knew about it. If it wasn't you may...

Does the IRS report the addresses of persons with warrants?

No they don't. Their computers don't even talk to each other let alone a separate law enforcement agency

Can I turn in my estranged husband that has a greencard to Immigration since he filed joint tax returns without my permission?

Whether or not somebody gets deported is not really a tax question.

no you don't but if you don't tell them you don't woe them a tax return they just assume you do. good luck trying to straighten it out.

Is this legal?

Talk to Block and see what the change was. Many times these returns get rejected because a dependent filed their own return so the dependent comes...

?

Your tax preparer could be in more trouble than you. Does your wife not want to file jointly?

Possible Tax Fraud, ID theft. If you file and ID theft affidavit then the IRS will investigate and could file fraud charges.

Can I claim my non immigrant mother in law, who spent 6 plus month of 2018 in our home, as a dependent on our 2017 return?

In addition to what has been previously posted, she will need an ITIN, since I am guessing she doesn't have a SSN

You need to make sure that anyone that was garnishing you gets a copy of that letter