Soon to be referred to as the younger brother

Well, I was curious tonight and decided to measure the kids. Couldn't find the tape measure so I used the growth chart that came with the Thomas Trains (not too sure on the accuracy). Looks like Jason may soon have to be referred as Emily's younger brother. She was 39 3/4 inches and he was 36 3/4 inches (according to the Thomas chart) . Seems like two years would give them a larger spread, wouldn't you think?