Question

my from childhood to adulthood was difficult for my parents transition modification disposition onslaught 1/25 dec 16 waygroul

Explanation:

The sentence is about the change from childhood to adulthood. "transition" means a change or movement from one state to another, which fits the context of moving from childhood to adulthood. "modification" is about making changes to something, "disposition" is about a person's inherent qualities or tendencies, and "onslaught" means an attack, so they don't fit.

Answer:

transition