You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where does the royal family get there money?" whose answer is hereditary revenues of the Crown.
Each document should contain about 30 words, and these documents should contain useful information.

Query: sources of royal family income
Useful Output:

Doc 1: The sovereign and the wider royal family have three main sources of income – the crown estate, the Duchy of Lancaster and the Duchy of Cornwall.
Doc 2: 1. The Royal Family is funded by a variety of private and public sources. The Royal Household, which supports the Sovereign and members of the.
Doc 3: The three main sources of the royal family's income include the Sovereign Grant, the Duchy of Lancaster and Cornwall.
Doc 4: Inheritance and blood are what makes for a royal family. The members of the royal family also generate income from their inherited properties.
Doc 5: The British royal family has wealth and receives income from several different sources, some with very long histories.