By Steve Lambert THE CANADIAN PRESS WINNIPEG- Three children died in separate drownings in Manitoba over a five-day period, RCMP said Tuesday. A 23-month-old boy was found last Thursday in Island Lake outside his family’s home in Garden Hill First Nation. The boy had been in the care of older siblings at the time and died in a Winnipeg hospital three days later, Mounties said. About 15 kilometres away on another Island Lake shore, a 10-year-old girl drowned at St. Theresa Point First Nation. Police said she and a friend had swum out too far on Sunday. A bystander managed to rescue the friend and a First Nation safety officer with dive equipment later found the girl in the water. Both communities are part of the Island Lake Tribal Council….