Your mother's sister is your aunt. Your mother's mother is your grandmother.
Your mother's mother is your grandmother. Your grandmother's sister is your great aunt, and your mother's aunt.
The English language does not include a relationship called "great mother." It has terms "grandmother" (the mother of your father or of your mother) and great grandmother (the mother of one of your grandparents. The sister of your grandmother is your great aunt. The sister of your great grandmother is your great great aunt.
Your great grandmother's daughter's daughter (i.e. your great grandmother's granddaughter) is you mother, your aunt, or your first cousin once removed.
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what is grandmother's sister to me in malayalam
Your grandmother's mother is your great grandmother, your great grandmother's mother is your great great grandmother, each time you go back another generation you add another "great" to the title.
Your grandmother's sister is your great aunt and her daughter is your mother's first cousin and your first cousin, once removed.
A great aunt because your grandmother's (mother's mother) sister would be your mother's aunt and one generation back would make them a great
Your mother's mother is your grandmother. Her husband is your grandfather or a person unrelated to you who married your grandmother either before or after your mother was born. If her husband is not related to you his son may be your mother's half-brother or may be unrelated. If unrelated the son's son's sister is also unrelated to you. If your mother's half-brother, then the son's son and his sister are your second cousins. If your grandmother's husband is your grandfather, then his son's son (his grandson) and the grandson's sister are both your second cousins.
Your grandmother's sister is your great aunt. Your grandmother's sister's daughter is your first cousin, once removed. (Your grandmother's sister's daughter and your mother or father are first cousins, and going one more generation to you on only one side is the "once removed" part.)
The mother or sister of the young woman expecting a baby can have a baby shower if they like. Often it is a sister that can arrange a baby shower and your sister will probably have another baby shower at work or by one of her friends.