Some queries about family relationships.
You can download the data for these queries at Family.ttl and FamiltyRules.ttl
Query ch6.29 Rules about family relations 
In the book itself, this appears as four queries, for four various specific relationships. We could do that here, but since they all appear under the number 6.29 in the book, we merged them together into a single query (using UNION) here. Does this query do exactly the same thing as the queries in the book?
Query ch6.30 Who's your uncle?
This rule defines "uncle" as a Man who is the sibling of a parent. Are there other ways to define this? Do they mean the same thing?