Thumb-sucking in triplicate will be a minor problem for Mr. and Mrs F. Gardiner, of Kalinga, when these three small boys arrive home from Boothville Maternity Home. Mr. and Mrs. Gardiner have three other children under the age of six. The triplets, who were born last night are (from left), Michael John (6lb. 3oz) Gregory Brian (4lb. 15oz.), and Neil James (4lb. 12oz.). Mrs. Gardiner smiles happily while the babies suck their thumbs contentedly.The babies - all boys - are the children of Mr. and