Do I have to file to be my mothers executer after she dies?

You need to consult a probate attorney, with specific facts, to determine if you need to file to open a probate.

When both (husband and wife) real property owners are deceased. Can their children use the a single small estate affidavits?

You will need to consult with a local attorney. But I would suggest filing an affidavit of death for the one who died first, and doing the small...

Why would a realtor have heirs to sign a Waiver of Will to have the heirs receive their inherit. as if the will was intestate?

You need to hire your own attorney to review the document and advise you as to your rights.

How long must I keep copies of my mother's will who died in 2016. I am an only child.

You should keep the will, especially if probate has not been filed yet.

I am the executor of my sister and brother in-in-laws Estate. What persentage is deemed fair in the state of Indiana?

Indiana allows for reasonable compensation. You should talk to your attorney about what that is, but usually a fair hourly rate for your time good.

How do I close deceased brothers checking without going clear to Kentucky,he had no will but I signed death certificate

They probably are referring to a Petition to Dispense with Administration, assuming that it is a small amount.

Send a letter declining the power of attorney.

How do I decline POA?

You can simply send a letter declining the appointment.

I assume a probate was opened, since you got the house and the money was divided. if the personal property wasn't distributed during the probate,...

The best way to accomplish this would be to not have that person as the initial trustee, and just amend to add them later, so the deed could be...