| 100% | SILAS | 5 | Surname of father-and-son N.B.A. coaches Paul and Stephen |
| 50% | MORA | 4 | Last name of father-and-son N.F.L. coaches |
| 50% | REINER | 6 | Surname shared by a Hollywood father and son |
| 45% | CAAN | 4 | Surname of father/son actors James and Scott |
| 45% | WES | 3 | ___ Matthews, either of an N.B.A. father-and-son duo |
| 44% | SCHAAP | 6 | Surname of a father-son ESPN sports reporter duo |
| 44% | BOHR | 4 | Surname of the father and son who won Nobel Prizes for Physics in 1922 and 1975 |
| 43% | PITT | 4 | Surname of father-and-son British prime ministers |
| 43% | IGLESIAS | 8 | Surname of father-and-son Latin pop singers |
| 43% | PITT | 4 | Surname of father-and-son British P.M.s |
| 43% | PELOPS | 6 | Son of Tantalus in Greek mythology killed by his father and served to the gods as a meal |
| 42% | STUS | 4 | N.B.A. coach Jackson and others |
| 40% | HARPER | 6 | Surname of the brothers in Two and a Half Men |
| 40% | KRONOS | 6 | Father of Poseidon and Zeus, with a K |
| 39% | NEMO | 4 | Son of Marlin and Coral, in a 2003 movie |
| 39% | TRINITY | 7 | Grouping of Father, Son and Holy Spirit |
| 39% | RAVI | 4 | A teacher of John, Paul and George |
| 39% | BOHR | 4 | Family name of father and son who won 1922 and 1975 Physics Nobel Prizes |
| 39% | KNICKS | 6 | Losers of the 1994 and 1999 N.B.A. Finals |
| 39% | EDSEL | 5 | Son of Henry and father of Henry II |
| 39% | ISSEL | 5 | Dan ___, former N.B.A. star and coach |
| 39% | IGLESIAS | 8 | Surname of Spanish singers Julio and son, Enrique |
| 39% | DERN | 4 | Surname shared by a Hollywood father and daughter |
| 38% | CLOONEY | 7 | Surname of A-list couple George and Amal |
| 38% | STEVEKERR | 9 | N.B.A. great with five championship rings as a player and three as a head coach |
| 38% | BUD | 3 | Name of a son on both "Married... with Children" and "Father Knows Best" |
| 38% | TURGENEV | 8 | Ivan —, Russian author of the novels Rudin and Fathers and Sons |
| 38% | STEPH | 5 | N.B.A. M.V.P. of 2015 and '16, familiarly |
| 38% | RILEY | 5 | Three-time N.B.A. Coach of the Year |
| 38% | PATRILEY | 8 | Three-time N.B.A. Coach of the Year |