Refers to the family of a king or queen, especially in a monarchical context. Common in news and historical discussions.
The British royal family is known around the world.
She married into the royal family of the neighboring country.
The royal family's crest is carved on the castle gate.
He is said to be descended from royal blood.
The heir to the royal family was officially announced.
She was born into a royal family and was raised strictly from a young age.
皇室 refers specifically to the Japanese Imperial family, while 王家 is used for royal families of other countries.
王家 refers to the royal family itself, while 王朝 refers to the ruling era or lineage that family maintains in power.
Compound of 王 (king) and 家 (family/house). The reading おうけ is the standard on'yomi combination.