The Family

Immediate Family

Masculine Feminine
fathermother
sondaughter
brothersister
husbandwife
When you have children, you are a parent.
If you are a male parent, you are a father.
If you are female parent, you are a mother.
If one of your children is a boy, he is your son.
If one of your children is a girl, she is your daughter.
When a couple gets married, the man is the husband, and the woman is his wife.
A brother and sister both have the same parents.
One collective word to describe brothers and sisters is siblings. However this word is normally only used in written English, not orally.

Different Generations

Masculine Feminine
Forefathers
Great-great grandfatheGreat-great grandmother
Great grandfatherGreat grandmotherr
GrandfatherGrandmother
FatherMother
SonDaughter
GrandsonGranddaughter
Great grandsonGreat granddaughter
Great-great grandsonGreat-great granddaughter
uncle: the brother (or brother-in-law) of your mother/father
aunt: the sister (or sister-in-law)of your mother/father
cousin: the child of your aunt/uncle
nephew: the male child of your brother/sister
niece: the female child of your brother/sister
When a couple gets married, the man is the husband, and the woman is his wife.
A brother and sister both have the same parents.
One collective word to describe brothers and sisters is siblings. However this word is normally only used in written English, not orally.

The In-Laws Family

The in-laws are the members of the family of your spouse (the person you are married to) or via a marriage in your family
father-in-law: the father of your spouse
mother-in-law: the mother of your spouse
son-in-law: the husband of your daughter
daughter-in-law: the wife of your son
brother-in-law: the husband of your sister
sister-in-law: the wife of your brother
Note: To refer to more than one brother-in-law or sister-in-law etc. we has an S to the brother/sister part. e.g. My brothers-in-law are fun. My sisters-in-laws are crazy

The Family Mix

Nowadays in many countries a person can get married more than once. These are the terms used to describe the "new" members of the family when someone gets remarried.
"Step-" means that you are related as a result of one parent marrying again
stepfather: the (new) husband of your mother but not your biological father
stepmother: the (new) wife of your father but not your biological mother
stepson: the son of your (new) husband / wife (he is not your biological son)
daughter-in-law: the wife of your son
stepdaughter: the daughter of your (new) husband / wife (she is not your biological daughter)
stepsister: the daughter of your stepmother or stepfather
stepbrother: the son of your stepmother or stepfather
Sometimes one of your parents gets married again and they have more children. There
half-brother: the brother you have only one parent in common with
half-sister: the sister you only have one parent in common with
Even if your parent didn't get married (and had the child outside of marriage), they are still your half-brother or half-sister.
However, note that it is common to still call your half-brother or half-sister just your brother or sister (without adding the half- part).