After two years of planning, renovations and pandemic delays , Krantz Cottage is opening its doors this weekend in Lake George. The family retreat, part of Ronald McDonald House Charities, had a ribbon cutting at the former law office of Howard Krantz, the village’s longtime attorney who died in 2015. Organizer say the retreat at 161 Ottawa Street will give sick children and their families a bit of respite as they endure lengthy hospital stays and taxing treatments.