Cornelis Buys I, also known as Master of Alkmaar, was his brother, as was Cornelis Buys II.
Ο Κορνέλις Μπούις Ι (Cornelis Buys I), γνωστός και ως Δάσκαλος του Αλκμάαρ ήταν αδελφός του, όπως και ο Κορνέλις Μπούις ΙΙ.