NEW YORK — Three people walking down a sidewalk in Brooklyn were seconds away from being struck by a massive falling tree Saturday.A couple and the wife’s brother were on their stroll just after 4 p.m. in the Bensonhurst neighborhood of Brooklyn when the tree fell.  Video shows the family doing a short dance after surviving their encounter.There is no word what caused the tree to fall, be it weather-related or just rot, but winds were gusting over 30 mph at the time of the incident.