Alida Sara Heijmans is the niece of my great grandmother. Her father, Alexander, was the brother of my great grandfather Lion Heijmans. Lion married Leah de Miranda and they had 6 children. Their eldest son was my mother's father.
Addition
Alida Sara Heijmans is the niece of my great grandmother. Her father, Alexander, was the brother of my great grandfather Lion Heijmans. Lion married Leah de Miranda and they had 6 children. Their eldest son was my mother's father.