Gallaudet football started in 1883, and over the
years there have been many father-son duos that played
this sport.

What about three generations (grandfather, father and son)?

The first one with this feat is the Chambers/Lange

Grandfather W.H. Chambers played on the 1899 team.

Father Robert Lange played on the 1947 team

Grandson William Lange played three seasons in
the eighties.

There was a second 3-generation group – grandfather
Albert Rose, father Jerry Moers and grandson
Willy Moers, but the Chambers/Lange group predated
them by about 20 years.