The Time Keeper's Burden. The Inheritance Wars, #1

Maya Chen-Valdez can slow time with a touch - but every second she manipulates ages her by years. When her grandmother dies for the second time and reality begins fracturing across major cities, Maya discovers she's part of an ancient guardian family tasked with protecting the fabric of existence itself. Reunited with her estranged siblings - Elias, who bends probability, and Zara, who rewrites perception - Maya must learn to work with the family she's avoided for three years.
Together, they face their great-uncle Marcus, who's spent thirty years planning to tear reality apart and remake it in his image. As temporal anomalies spread and dimensional barriers collapse, the siblings race to master abilities they barely understand. But the greatest threat isn't Marcus or his extra-dimensional allies - it's the fractures in their own family bonds. Can three broken siblings learn to trust each other before reality itself tears apart?