How many Joseph's do I have as a grandparent?

Ziminski: 3; gggg grandfather Lindner, ggg grandfather Lindner, ggg Nalewalski
Bocamazo: 2; ggg grandfather DeCosmo, g grandfather Bocamazo
Dyson: 2; gggg grandfather Scholes, gggg grandfather Wood
Lesser: 0; not a single Joseph
O'brien: 0; not a single Joseph

Total: 7 grandfathers