question: Which Canadian screenwriter whose child wrote M5 produced a film and executive produced M1 and M2
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:film.producer.films_executive_produced M1 .
  ?x0 ns:film.producer.films_executive_produced M2 .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:people.person.children|ns:fictional_universe.fictional_character.children|ns:organization.organization.child/ns:organization.organization_relationship.child ?x2 .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  ?x1 a ns:film.film .
  ?x2 ns:film.writer.film M5
  }