Did M2 and M3 found M1 's sibling 's employer and found a company
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x1 ns:business.employer.employees/ns:business.employment_tenure.person ?x2 .
?x2 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 M1 .
FILTER ( ?x2 != M1 ) .
M2 ns:organization.organization_founder.organizations_founded ?x0 .
M2 ns:organization.organization_founder.organizations_founded ?x1 .
M3 ns:organization.organization_founder.organizations_founded ?x0 .
M3 ns:organization.organization_founder.organizations_founded ?x1
}