when they were children
Ni Tom ni Mary vivían en Australia cuando eran niños.
Neither Tom nor Mary lived in Australia when they were children.
Será como cuando eran niños hace mucho tiempo.
It will be like when they were children a long time ago.
— Campo de sueños (1989)
Cuando eran niños, te pedía que encontraras a Dev cuando se perdía.
When they were children, I used to ask you to find Dev when he got lost.
— Devdas (2002)
Tanto Tom como Mary vivían en Boston cuando eran niños.
Both Tom and Mary lived in Boston when they were children.