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.
If it’s the right hand spaces are FACE (f, a, c, e) from bottom to the top. The line notes are every good boy deserves fudge (e, g, b, d, f,) from bottom to top