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|context> => |context: Fred's family>

supported-ops |person: Fred> => |op: parents>
parents |person: Fred> => |person: Richard> + |person: Joan>

supported-ops |person: Jane> => |op: parents>
parents |person: Jane> => |person: Richard> + |person: Joan>

supported-ops |person: Richard> => |op: parents>
parents |person: Richard> => |person: Esma> + |person: Harold>

supported-ops |person: Joan> => |op: parents>
parents |person: Joan> => |person: Paul> + |person: Margret>

supported-ops |person: *> => |op: grand-parents> + |op: children> + |op: grand-children>
grand-parents |person: *> #=> parents parents |_self>
children |person: *> #=> inverse-parents |_self>
grand-children |person: *> #=> children children |_self>
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