question: Was M3 founded by M4 , founded by a actor , and founded by M1 's female employee 's sibling
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?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 ?x2 .
  ?x2 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x2 ns:people.person.gender ns:m.02zsn .
  FILTER ( ?x1 != ?x2 ) .
  M3 ns:organization.organization.founders ?x0 .
  M3 ns:organization.organization.founders ?x1 .
  M3 ns:organization.organization.founders M4
  }