| 100% | ARKIN | 5 | Last name of father-and-son actors Alan and Adam |
| 82% | ALDA | 4 | Last name of father/son actors Robert and Alan |
| 70% | ONEAL | 5 | Last name of father-and-daughter actor Ryan and actress Tatum |
| 68% | STILLER | 7 | Last name of Jerry and Ben, acting father and son |
| 65% | GRIESE | 6 | Last name of father-and-son quarterbacks Bob and Brian |
| 60% | BUSH | 4 | Last name of father-and-son US presidents |
| 59% | MORA | 4 | Last name of father-and-son N.F.L. coaches |
| 57% | MAHAL | 5 | Last name of father-daughter singers Taj and Deva |
| 55% | BOHR | 4 | Family name of father and son who won 1922 and 1975 Physics Nobel Prizes |
| 54% | ONEAL | 5 | Last name of actor Ryan and his daughter, actress Tatum |
| 52% | ALDAS | 5 | Father-and-son actors Robert and Alan |
| 51% | GLEESON | 7 | Father and son actors Brendan and Domhnall |
| 50% | ALI | 3 | Last name of father-and-daughter members of the International Boxing Hall of Fame |
| 50% | ALDAS | 5 | Father-son actors Robert and Alan |
| 49% | OBAMA | 5 | Last name of Sasha and Malia |
| 49% | BAGGINS | 7 | Last name of Frodo and Bilbo |
| 48% | ASSAD | 5 | Name of father-and-son world leaders |
| 48% | ALDAS | 5 | Noted father and son actors |
| 47% | HESTON | 6 | Last name of The Ten Commandments actor Charlton |
| 47% | TAM | 3 | Last name of Simon and River, on "Firefly" |
| 47% | JACKBLACK | 9 | "King Kong" and "School of Rock" actor whose first and last names rhyme: 2 wds. |
| 47% | SMOTHERS | 8 | Last name of Tom and Dick, folk comedy "Brothers" |
| 47% | ZAPPA | 5 | Last name of Frank and kids Moon Unit, Dweezil |
| 47% | BABBITT | 7 | Last name of 30- and 35-Across |
| 46% | STARK | 5 | Last name of Sansa and Arya, on "Game of Thrones" |
| 46% | RIPA | 4 | Last name of Kelly from "Live With Kelly and Ryan" |
| 46% | CAAN | 4 | Surname of father/son actors James and Scott |
| 46% | OLSEN | 5 | Last name of twins Mary-Kate and Ashley |
| 46% | REDD | 4 | Actor Foxx of "Sanford and Son" |
| 46% | VANPELT | 7 | Last name of Linus and Lucy in 44-Across: 2 wds. |