What do I do?

There are a lot of moving pieces based on what you described. Consult an attorney for assistance. Call you local bar association to qualify if...

Can his daughter do anything to over ride my Mom

I am not sure what "backup" means. It depends on the terms of the POA. Some POAs require the agents to act jointly (the agents must act...

Uncle Not Cooperating

You should contact your local bar association and see if you are qualified for pro bono legal services.

Does a beneficiary's trust need to be registered with the courts as to it's existence so they have visibility of it?

Usually a trust is filed with a court if there is an ongoing litigation. It may also required to be recorded with the county clerk if it pertains...

Are lawyer's fee recoverable if I challenge estate's accounting and win?

It is unlikely in New York. This is a question you could discuss with the attorney at the consultation,

How can I report my equivalent of social security benefits from Canada on my 1040? Does it go on line 20a of 1040 or ln21 in2014

Foreign retirement benefits are taxed as annuities for U.S. purposes, line 16, not 20. There may be treaty benefits available. This is tax return...

I am not sure if you are referring to the Premium Tax Credit. The credit is available to those filing 1040 or 1040NR. See the link below.

If my husband and I are separated, can he file a tax return with me, without my knowledge?

I am not sure what you mean by "secondary." Did you mean he was trying to file a joint return? I assume that you filed as "married filing...

Can i sue him with this issue

You should consult with the attorney who handled your divorce. Right to claim dependent on tax returns is usually one of the items covered in a...

What can i do about my mother (life estate holder) who is failing to pay taxes when i have remainder in fee simple rights?

As a life tenant, you mother has right to live in and use the property for her life. She has the obligation to pay taxes and maintenance, and...