Man i used to play percussion too in middle school. i play sax now and basically forgot everything bout how to play drums but i hope this exercise can help your sibling. And make sure he plays along with a metronome at his own tempo.
Rembrandt Harmenszoon van Rijn was a Dutch draughtsman, painter and printmaker. An innovative and prolific master in three media, he is generally considered one of the greatest visual artists in the history of art and the most important in Dutch art history.