Two Barking Boys

This is a funny game which Abey and Sebby engage in for minutes (lengthy periods, for a baby!) at a time. Abey holds the cup up to his mouth and makes some sound in it. Then he holds it up to Sebastian and Sebby makes the same sound. And so forth. When Abey gets tired of playing this, Sebby will often crawl after him and hold the cup up to Abey's mouth, trying to get him to play some more.