das Königshaus
royal family
The family of a king or queen; the ruling dynasty of a monarchy.
Das britische Königshaus steht oft im Mittelpunkt des öffentlichen Interesses.
The British royal family is often at the center of public interest.

royal family / royal residence
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royal family
The family of a king or queen; the ruling dynasty of a monarchy.
Das britische Königshaus steht oft im Mittelpunkt des öffentlichen Interesses.
The British royal family is often at the center of public interest.

The word is made up of 'König' (king) and 'Haus' (house). In German, 'Haus' can refer both to a building and to a family or dynasty. This double meaning explains the two meanings of the word.
Das Königshaus Windsor hat eine lange Geschichte.
The House of Windsor has a long history.
The context makes it clear which meaning is intended. If it is about people, politics, or a dynasty, it means the royal family. If it is about a place, architecture, or tourism, it means the building.
Ein Mitglied des Königshauses wird die Zeremonie eröffnen.
A member of the royal family will open the ceremony.
When the royal family is meant, the word is often used with a nationality. Typical examples are 'das britische Königshaus' (the British royal family), 'das schwedische Königshaus' (the Swedish royal family), or 'das spanische Königshaus' (the Spanish royal family).
Die Hochzeit im dänischen Königshaus wurde im Fernsehen übertragen.
The wedding in the Danish royal family was broadcast on television.
castle / lock
'Schloss' and 'Königshaus' can both have to do with kings, queens, and their residence. 'Schloss' clearly means the building. 'Königshaus' very often means the royal family or dynasty. But it can also mean the royal residence. That is why learners may confuse the words. If you are talking about walls, rooms, a garden, or a visit, 'Schloss' is usually more precise. If you are talking about the family, news, or decisions of the monarchy, 'Königshaus' fits better.

Am Abend berichten die Nachrichten über das Königshaus.
In the evening, the news reports on the royal family.
Im Bus erzählt die Reiseleiterin etwas über das Schloss und seinen Garten.
On the bus, the tour guide tells us something about the castle and its garden.