Barni i bet your mother was educated with a degree but most of the somali parents have minimum to no educationStop generalizing. Some Somali parents value sex education and don't mind answering their children curious questions. I have a great relationship with my mother (alhamdulilah) and could ask her everything and she would answer as good as she could.
Young children generally don't understand the concept of sex, and usually make up their own assumptions of how a child is created.