Meanings:-

Mother (माता/माँ) - Someone's female parent

Parent (माँ-बाप) - Someone's father or mother

Son (बेटा) - Someone's male child

Daughter (बेटी) - Someone's female child

Brother (भाई/भैया) - A boy or man who has the same parents as another person

Sister (बहन) - A girl or woman who has the same parents as another person

Siblings (एक माँ की संताने) - A brother or sister

Elder (ज्येष्ठ) brother or sister - A brother or sister who is older than you

Younger (छोटा) brother or sister - brother or sister who is younger than you

Husband (पति/घरवाला) - The man who a woman is married to

Wife (पत्नी/ घरवाली) - The woman who a man is married to

Spouse (पति या पत्नी) - Someone married to another person; husband or wife

Uncle (चाचा/मामा) - Brother of someone's mother or father

Aunt (चाची/मामी) - Sister of someone's mother or father; your uncle's wife

Nephew (भतीजा/भांजा) - Son of someone's brother or sister; son of your husband's or wife's brother or sister

Niece (भतीजी/भांजी) - Daughter of someone's brother or sister; daughter of your husband's or wife's brother or sister

Cousin (चचेरा/ममेरा - भाई/बहन)- Child of someone's parent's brother or sister; child of aunt or uncle

Grandfather (दादा/नाना) - Someone's parent's father

Grandmother (दादी/नानी) - Someone's parent's mother

Stepfather - Husband of your mother (but not your real father)

Stepmother - Wife of your father (but not your real mother)

Stepbrother - son of your stepfather or your stepmother

Stepsister -  daughter of your stepfather or your stepmother

Stepson - son of your spouse (from an earlier marriage)

Stepdaughter - daughter of your spouse (from an earlier marriage)

Father-in-law - father of your spouse

Mother-in-law - mother of your spouse

Brother-in-law - brother of your spouse

Sister-in-law - sister of your spouse

Son-in-law - husband of your daughter 

Daughter-in-law - wife of your son

Boyfriend - a boy or man that a girl or woman goes out with

Girlfriend - a girl or woman that a boy or man goes out with

Widower - a man whose wife has died

Widow - a woman whose husband has died

Bachelor - a man who has never been married

Spinster - a woman who has never been married

Single - a person who isn't married and doesn't have a boyfriend or girlfriend

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Some words and meanings :-

Infant - a baby or very young child, newborn child

Baby - a very young child

Toddler - a young child who has just learnt to walk

Marriage - a legal relationship between a husband and wife

Get engaged - agree to marry somebody

Wedding - a marriage ceremony, the act of marrying

Bride - a woman on her wedding day

Groom - a man on his wedding day

Honeymoon - a holiday by a couple who have just got married

Divorce - the legal ending of a marriage