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If by "stepson" you mean someone who was legally adopted into the family - yes, they are a legal relative. However, they are NOT considered to be a "blood" relative.
In Malayalam, grandaunt can be translated as "പേരമ്മ" (peramma).
Yes you are.
Yes, your husband is considered to be your closest relative.
achanteyo ammayudeyo maami (ammami)
2nd uncle I believe
An in-law is a relative by marriage rather than by blood. For example, a spouse's parents are considered in-laws to their child's partner.
A blood relative is a person who is related to another through a common ancestor, not by marriage or adoption.
4th cousin
Your sister is her great grandaunt.
Yes, your niece is the daughter of your sibling (sister or brother), so there is continuity of "blood" (i.e., genetic descent) from your common parent(s), assuming your sister/brother and her/his daughter are not adopted.
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