Petrus (Piet) Johannes Maria Spermon (1931) married with Riet Zwijsen (1933), their children are:

- Rob (1959) married with Ellen van Nistelrooy;
- Mark (1965-1989);
- Nicole (1967).


Rob Spermon (1959) and Ellen van Nistelrooy (1958) have 3 children:

- Joep Pjotter Mark Eric (1991);
- Lot (1993);
- Niek (1995).

Nicole Spermon (1967) has 2 children:

- Juul (1994);
- Fien (1996).