code: public void removeRelationship(String baseTableName,
  			String relatedTableName, String relationName) {
  
  		try {
  			if (extendedRelationsDao.isTableExists()) {
  				List<ExtendedRelation> extendedRelations = getRelations(
  						baseTableName, relatedTableName, relationName, null);
  				for (ExtendedRelation extendedRelation : extendedRelations) {
  					removeRelationship(extendedRelation);
  				}
  			}
  		} catch (SQLException e) {
  			throw new GeoPackageException("Failed to remove relationship '"
  					+ relationName + "' between " + baseTableName + " and "
  					+ relatedTableName, e);
  		}
  
  	}
docs: Remove a specific relationship from the GeoPackage
  
  @param baseTableName
  base table name
  @param relatedTableName
  related table name
  @param relationName
  relation name