Joe Redington Sr. is the father and the mother is Dorothy Page.
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A grandpa is a grandfather, the father of your father or mother.
Dorthy Redington because she is the wife of Joe Redington Sr.
Your maternal grandmother is the mother of your mother. Similarly your paternal grandmother is the mother of your father, paternal grandfather is father of your father and maternal grandfather is father of your mother.
No, but she can be your half-sister - if your sister marries your father or if your mother gives birth to you with her father (your grandfather).