My mother, Peggy, the administrator to this account passed away. I need to be added as the administrator to this account.

I am sorry for your loss, please provide more information on your requirements.

What do you need to become administrator of, is that your mother's Outlook account or a Microsoft 365 Family account, or is it something else.

If that is just an Outlook account, are you able to access that account, do you know the associated password.

How do I add myself as administrator?

I am 71 years old and need to be added as administrator