Sitter Job in Cornwall, Ontario

i have 3 kids who I need a sitter for the summer and continue after that...I have a job that is all different hrs ..I need someone who can be available almost every Friday and every second saturday.. some weeks could be a few shifts and others maybe once.. they could be all day or just a few hours. In long sault at my house..I do get last min calls so must be able to do that..but I know at least the day before