My mom was born in Greece. She says that because I am her child, I also have it. Is this true? And, if not, how do I go about obtaining dual citizenship. I plan on traveling extensively to Greece and mom has a home and other property there that is being willed to her children. I will be the one overseeing her property. If I do have dual citizenship, how do I go about proving such? Thanks for your help

You go to the nearest Greek Consulate and inquire.

It is true. If your mother had Greek citizenship when you were born, you already have Greek citizenship.

You and your mother need to report your birth to the nearest consulate. You will be issue Greek birth certificate, and then Greek passport.

It's not that easy. There are a few things that you need to be sure of:

a) was/is your mother a Greek citizen? If so, then she is registered in the records (dimotologia) of a municipality in Greece. If that has happened, you are 95% there.

b) were you born after May 8th 1984?
I) If yes, then you are a Greek citizen by birth. Go to the consulate, and you're all set, you are a citizen by birth according to Article 1 of the Code of Greek Citizenship.
II) If not, then you need to also look at your parents' marriage ceremony to decide how you will get Greek citizenship. Long story short, if your parents were married in a ceremony that was substantiated by the Greek state at the time (ypostatos gamos), then you will have to apply for citizenship via Article 14 of the Citizenship Code at your local Greek Consulate. You will be a Greek citizen as of the date of the application. If your parents' marriage was not considered "ypostatos", or if you were born out of wedlock, then the Greek state may consider you a Greek citizen as of your birth but that will be a special situation that they can explain more about.

In either case, step 1 will be to get your mother's registration certificate from her municipality in Greece. Once you have that, you can go down the path of claiming citizenship yourself.

The process will take between 2 and 4 years, depending on what municipality you are registered in. Best of luck.