Niece
Nephew
the man who someone is engaged to be married to
a son of your sister or brother, or a son of the sister or brother of your husband or wife
Fiancé
Sibling
a brother or sister
a job or piece of work that is often boring or unpleasant but needs to be done regularly
Chore
a daughter of your brother or sister, or a daughter of your husband's or wife's brother or sister