Were M2 and M3 produced by a company that M1 founded
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:organization.organization.founders M1 .
M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
M3 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}