Frank Sinatra duetted "Somethin' Stupid" with which family member?

The legendary Frank Sinatra claimed his final Billboard Hot 100 top 10 hit — and second No. 1 — thanks to an unlikely duet with his daughter Nancy Sinatra. The latter already had some hits under her belt — including the No. 1 “These Boots Are Made For Walkin'” in 1966 — so the “Stupid” pairing wasn’t simply a riding-the-coattails moment for the Chairman’s daughter. It is the only father-daughter duet to reach the top of the Hot 100, where it spent four weeks.

Source: Billboard