# filename: ex188.rq

PREFIX ab: <http://learningsparql.com/ns/addressbook#>
PREFIX d:  <http://learningsparql.com/ns/data#>

CONSTRUCT
{ ?p ab:hasGrandfather ?g . }
WHERE
{
  ?p ab:hasParent ?parent .
  ?parent ab:hasParent ?g .
  ?g ab:gender d:male .
}