Did a screenwriter influenced by M4 's sibling and influenced by M3 influence M1 and influence M2
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:influence.influence_node.influenced M1 .
?x0 ns:influence.influence_node.influenced M2 .
?x0 ns:influence.influence_node.influenced_by ?x1 .
?x0 ns:influence.influence_node.influenced_by M3 .
?x1 ns:people.person.sibling_s/ns:people.sibling_relationship.sibling|ns:fictional_universe.fictional_character.siblings/ns:fictional_universe.sibling_relationship_of_fictional_characters.siblings M4 .
FILTER ( ?x1 != M4 )
}