Caractacus' film character was written as a widower who develops a romantic relationship with Truly Scrumptious, the daughter of the sweets magnate, Lord Scrumptious.
Truly and Caractacus dance and sing a duet (Doll on a Music Box/Truly Scrumptious) to distract the Baron's staff as children around the castle plant their own booby-traps and free Grandpa and the Potts children to help with the battle against the wicked Baron.
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He thinks that he has ruined his chances of selling the sweets, when Truly unexpectedly supports him and helps him to make a successful pitch to her father (with the help of the song and dance routine (Toot Sweets).
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As Caractacus and the children leave, she watches them and sings about her love for Caractacus (Lovely Lonely Man) before returning to her family mansion.