How can my mother or his siblings obtain the knowledge or rights to obtain his business and properties that he own or shared?

A marriage that took place after the marriage of your mom and dad would be void if they were never divorced. You will need an attorney to help...

Same as above

You would know because you signed the document or you would know if someone acted in your behalf using the document. The document could also be...

Can either or both of the trustees be changed? If so, how and by whom? What if a trustee no longer wishes to serve?

Both trustees can resign-language in the trust usually details how the next trustee is selected. A trustee can be removed for various reasons by...

What can he receive? Elective share states 40% but childrens rights claim equal? Is His place part estate if she paid bills?

The land would be in your mothers estate and subject to the statutory share. The new spouse does not have to exercise this right if you can...

What do I do

Best bet would be to have an attorney prepare the documents and come to the house The attorney will arrange the notary services.

Can simple changes to Trusts be safely done without a lawyer?

I agree with just getting a quote from another attorney.

Do I have any recourse?

I agree that you have recourse-give them notice and a chance to fix it-if they don't respond hire an attorney.

Where do I get information

I agree with all of my colleagues-hire an estate planning attorney to discuss your options and prepare your documents. Many estate planning...

You should use an estate planning attorney to advise you if probate is even necessary. The will should be filed in the county of the deceased. If...

Is the will valid? how do I proceed? Also what should we do with the bonds? Can I just keep them or are they part of his estate

Take the will to an estate planning/probate attorney. Hopefully it is also witnessed. The attorney can advise you of the next steps after...