Did a screenwriter whose sibling directed M3 , wrote M4 's sequel , and wrote M2 marry M1
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 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 ?x1 .
?x0 ns:people.person.spouse_s/ns:people.marriage.spouse|ns:fictional_universe.fictional_character.married_to/ns:fictional_universe.marriage_of_fictional_characters.spouses M1 .
?x1 ns:film.director.film M3 .
?x1 ns:film.writer.film ?x2 .
?x1 ns:film.writer.film M2 .
?x2 ns:film.film.prequel M4 .
FILTER ( ?x0 != ?x1 ) .
FILTER ( ?x0 != M1 )
}