For Umra you can apply for re-entry visa for them from the immigration dept , after extending there stay here then you can apply through hajj and umra agencies in qatar for umra visa for them . i think KSA will allow the first degree relatives , mother , father , wife and children( family visit visa) to get umra visa for ramadan .the cost depends on way of travel to Mecca ofcourse and type of accomodation your looking for and whether with group or alone .