Max is of German, English, Norwegian, Danish, Irish, Dutch Jewish, French Jewish, Scottish, and Northern Irish descent (most "Thieriot" families come from Germany).
Max's paternal grandmother was born in Manila, in the Philippines, to American parents, from Virginia (who were of English, and some German, descent). Max's paternal grandparents died in the sinking of the SS Andrea Doria, the Italian ocean liner, in 1956.
Did all of his own singing in The Pacifier (2005).
On his father's side, he is the grandson of Ferdinand Melly Thieriot and Frances Harrison Dade. On his mother's side, he is the grandson of Donald Ross Snyder, Jr. and Nancy Jo Neuhalfen.
Has 19 pets.