[REQ] Con... fusione (1980)

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"Piero, director and father of Carlotta, an 8-year-old girl, is in crisis due to the abandonment of his wife who no longer wants to know about him. Despite the good performance in the field of work, Piero encounters several difficulties in caring for Carlotta who turns out to be in need of attention. Driven by Carlotta's will, Piero embarks on a journey without a destination in an attempt to distract himself from her problems and during the journey he meets a hitchhiker. The girl with a wandering nature drags Piero and Carlotta between the most disparate destinations and this causes the child to become attached to the girl, seeing her as a mother figure."
Machine translated from Italian Wikipedia.
The daughter is played by Carlotta Natoli, the real world daughter of the actor who plays the father, Piero Natoli, who is also the director.