As described in the example documentation: https://mariadb.com/kb/en/library/oqgraph-examples/

I find it very useful to add the previous linked node in the sequence result when querying the graph:

SELECT * FROM oq_graph g

WHERE g.latch='dijkstras' AND g.origid=1;

That helps to implement relationship types and restrict them in the query like:

SELECT * FROM people_graph g

JOIN people_relationships d ON d.destid = g.linkid AND d.origid = g.previd

WHERE g.latch='dijkstras'

AND g.origid=1

AND d.relationship='friendship';

Which only shows friends and friends of friends, but no family members.