Sounds like an odd construction. Would need to see the will.

Yes, a codicil has the exact same execution requirements as a will.

The estate has a right. The next of kin might have to get court letters to get the records.

You cannot revoke a waiver and consent. However, there may be petitions you could file to reign in the administrator or have them replaced.

You have to bring what is called a partition action in Supreme Court. It goes like a foreclosure. However, nearly all cases settle with some sort...

If it was owned with right of survivorship, the significant other's estate inherited it, and you have no interest.

No. What you can do depends upon what has already happened.

Check with the Surrogate Court to see if there is an estate and file a claim with the executor or administrator.

Yes, but there may be a statute of limitations ultimately barring some older claims.

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As you do not have a will, you can file for an administration. That will force your brother to file the will, or you will be appointed...