A wife is the female partner in a marriage.
The plural is wives. Follow the link for more about plurals that change the spelling of the singular in this way.
A daughter is what parents call their female child. A male child is called a son
A husband is the male partner in a marriage.
A sister is a female who has the same parents as you have. A half-sister is a female who has one parent that is the same as you, but not the other parent.
A brother is a male who has the same parents as you have. A half-brother is a male who has one parent that is the same as you, but not the other parent.
Grandchildren are the children of someone's children. Great grandchildren are the children of someone's grandchildren.
Mum and dad is an informal of saying mother and father.
An uncle is the brother of your parents.
Aunty is another way of saying aunt, the sister of your parents.
Grandparents are the parents of parents.
The children of brothers and sisters are to each other cousins or first cousins. The children of first cousins are second cousins to each other. For your relationship to the child of your first cousin you use the term first cousin once removed.