Inheritance of a stepmother

I need some clarification: My father passed away in May. We are 2 siblings, A brother and sister I have a stepmother but she has no children. My daddy's parents are late.

1. My daddy wrote in his will that my stepmother can stay in the house as long as she wants to, and she will be responsible for all maintenance while living there.

My brother and I lives in Gauteng and she lives in the North West.

2. My daddy has a cottage in the yard where he was collecting rental. I also want to know does she get anything from there?

My grandfather and his brothers were in a family business. Now Every month all their kids collect rental from this business. My dad was also receiving. All his brother's has passed away. I want to know if my stepmother also gets anything from this rental or only his children?

The family has properties in India too, where they will be getting some money, does my stepmother get any shares from it or only his children?

3. My main question is does my stepmother inherit anything from the family inheritance such as the rental now that my daddy has passed or does she only inherit from the estate of what was already there when he passed away?