Today show star Al Roker was feeling nostalgic over the weekend as he looked through old family photographs.The doting dad-of-three couldn't resist sharing one particularly sweet photo of his two youngest children, Leila and Nick, on Instagram, during a fun day out sledging in the snow.MORE: Al Roker's wife Deborah shares heartfelt tribute following sad newsThe picture was dated 2011 and was taken in Central Park, and Al's wife Deborah Roberts was one of the first to reminisce about the picture,