The alternate executor only steps in if the primary is unable (sick or dead, for example). In any other case, such as disagreement, the alternate's role is simply to bring to the attention of the court any misconduct that he/she becomes aware of.

If the executor is engaging in willful misconduct, then the court can be petitioned to address it. In some cases, the court will just correct the problem (such as fixing an accounting error). But, in extreme cases (improper distribution of assets, waste), the executor can be removed and replaced by the alternate (if there is one) or by someone else appointed by the court.

Please note, however, that some wills have no-contest clauses. You have to be careful before taking any action, but I am sure the attorney that you hire to prepare your paperwork will be able to discuss the particulars of your case and advise you accordingly.

Yes, codicil is an amendment to a will. That language, which is standard for wills, basically says that the will you have in your hands is the most recent and accurate copy and that it is to be followed - not any other will created before it.

Right, the original will should be available along with the codicil. It may be on file with the county clerk, but it should be available to the executor. Ordinarily, the codicil will be attached to and refer to the original will by date.Amber E.41093.1619106829

Yes, you can contact the probate court. If they have a copy on file, it should be available at modest cost as a public record. If there is a no contest rule, you will know it when you see it - it will say something to the effect that if anyone challenges the will then they forfeit their inheritance.

You mentioned that she may have been coerced. If you can prove there was coercion, such as by eye witness testimony, that may be grounds to contest the change. Another grounds may be lack of capacity, if your mom was suffering from old age, Alzheimer's or something along those lines.