Time Snatchers — Richard Ungar

Caleb's blinders are off. The small group of orphans who were also "adopted" by Uncle used to feel like family, but the competition to be the top time snatcher and the punishment for failure has gotten fierce. Time traveling to steal valuable objects can be a thrill, but with bully Frank trying to steal his snatches, his partner Abbie falling for Frank's slimy charms, and Uncle's plans to kidnap innocent kids to grow his business, Caleb starts thinking about getting out. But Uncle's reach extends to any country in any time period, and runaways get the harshest punishment of all.

Caleb can steal just about anything from the past, but can he steal a family for the future?