Seventeen years ago, Bakul Bala left home without saying anything in search of her daughter Alo Rani, who was then 16.  She never came back to her son Thakur Krishna Halder, who was then 28. Nor did the sister she went out looking for. In one evening, Krishna lost them both.   But, as fate would have it, Krishna finally got back his mother after 17 long years last Sunday - at Tital Intersection in Sabujbagh area of Patuakhali district town.     Bakul Bala was a resident of Talbaria village in Galachipa upazila of the district. She has two sons and two daughters in her family. Her elder daughter, Alo Rani, was married off at the age of 16.