SOCIAL SECURITY FOR MIGRANT WORKERS - FAMILY ALLOWANCES - PURSUIT OF A PROFESSIONAL OR TRADE ACTIVITY BY A WORKER IN ONE MEMBER STATE - RESIDENCE OF MEMBERS OF FAMILY IN ANOTHER MEMBER STATE - PURSUIT OF A PROFESSIONAL OR TRADE ACTIVITY BY THE SPOUSE OF THE WORKER IN THE COUNTRY OF RESIDENCE - RIGHTS TO FAMILY BENEFITS OR ALLOWANCES - COMMUNITY RULE AGAINST OVERLAPPING BENEFITS - CONDITIONS FOR THE APPLICATION ( REGULATION NO 1408/71 OF THE COUNCIL , ARTS . 73 AND 76 )