Mamma=Mother Pappa=Father Föräldrar=Parents
Rich children: Mother, Father/Sir (mama or papa informally) Poor children: Ma, Pa
Father: Otousan or otouchan, or papa Mother: Okaasan or okaachan, or mama
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.
The brother of your father or of your mother is your uncle. Also, the husband of your mother's or father's sister is your uncle. In addition, it is not uncommon for children to call any adult male an uncle who is closely involved with them and their family as financial or social support, etc., even if that person is not a relative.
Grandmother
She is your Grandmother.
grandfather
mother/father in law
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."
Grandmother in English. English does not distinguish between the Mother's mother and the Father's mother, they are both called Grandmother.