My close relative JOHN was mentally ill he has always sought the help of psychiatrists would his will be valid?

It depends... what is the degree of the mental illness... what is the degree of relationship? Talk to a local attorney.

Can a person who is married and lives with his present wife give power of attorney to his ex wife over all assets to all he owns

Yup. (Although my vulgar curiosity wonders what is going on here....)

My parents put a property in my name before they passed away and verbally conveyed that it belonged to me and my two brothers.

Q: Do i and my living brother have any recourse. [?] A: I think you are totally out of luck. This falls into the truth stranger than fiction...

When a life estate owner leaves the estate what kind of time are we looking at?

In Michigan, 15 years.

Do I need an Attorney to obtain a power of Attorney for Health in Illinois? How about a TODD Transfer of Death Deed?

Most everything a lawyer can do for you, you can do for yourself, but that doesn't make it a good idea. I'm sure there are attorneys in your area...

I want to receive Power of Attorney for my husband who is in the VA Home and has dementia. What will that cost?

Depends on the degree of dementia... if he is not competent, you cannot get the power of attorney, at any price. Consult with counsel!

How to determine if probate is necessary when family members are uncooperative?

Don't know.

Get the settlement order/judgment recorded against the property.

Does a trust that failed to be executed have any baring when mentioned in a will?

Depends (but you knew that!)... The un-executed trust may be admissible as evidence of the grantor's intent at the time of signing the will......

What are laws concerning retention of a parent's home by an adult disabled child upon the parent's death?

Have the terms of the reverse mortgage reviewed by an elder law attorney, but I'd be surprised if brother will be allowed to keep the house.