Relatives gathered for New Year's.
彼は遠くの親戚を訪ねて北海道へ行った。
He went to Hokkaido to visit a distant relative.
At New Year's, relatives get together and have a meal.
During summer vacation I visited relatives in the countryside.
He is a relative of my father's.
I plan to rely on relatives until I find a new place to live.
家族 usually means the immediate family living together, whereas 親戚 refers to extended relatives who may live elsewhere.
親戚 is the common, casual word for relatives in general (blood or marriage), while 血縁 is a more formal term limited to blood ties.
kinship relations; extended family ties
relations with relatives; socializing with relatives · treating a non-relative as family; being on close terms as if relatives