You can call father “ପିତା” (pita) in Oriya.
Bapa maa
Father is called "ପିତା" or "ବାପୁ" in Oriya language.
Mother=Bou
bapa
you call god father and mother tresa is a saint
You can call her by her first name or if your comfortable some son-in-laws call them mom.
Chheli
Grandmother
grandfather
She is your Grandmother.
Your half-sister's mother may be your mother, if you have different fathers. If you have different mothers and your father is married to your half-sister's mother, then you probably should call her "mother." If your half-sister's mother is not connected to your father (i.e. her father married your mother) then there is no relationship name for you to call her mother, other than "my half-sister's mother."