I found some footage of Christmas 2005 when Tyler was 3 and Aaron was 2, I would have been pregnant with Jackson at the time.  It was the Christmas that Mark stayed up really late the night before putting these large, complicated lego animals together for Tyler.  Go Mark!  The video is about 8 minutes long, sorry, probably only me and the Grandmas will watch the whole thing but you should at least skip toward the middle where Tyler does a wild ribbon dance for the camera, no wonder he specifically requests for me to stop taking pictures of him!