Melinda Gates' son's name is Rory who she thinks is a feminist. Here is the main article, and here is the main portion:
Rory, for his part, does. Across 18 years of conversations, sharp observations and everyday actions, he’s demonstrated his belief that gender equality is something worth standing up for. When we talk about these issues at the dinner table, he (and his friends!) have a lot to say.
Feminist: a person who believes in feminism, and tries to achieve change that helps women to get equal opportunities and treatment
The paragraph is followed by an example where Rory supported gender equality and thus believed that women have equal rights on everything.
So, she's talking about raising Rory. And, while raising him, she thinks back that how her own parents were also supporting the gender equality.