Maybe he gets the power of telepathy. This would allow him to know what his sisters are thinking and help him avoid getting into trouble with them. He could also use it to help his friends at school when they are having problems.
Another idea is that he gets the power of flight. He could fly around the town, having adventures and seeing things from a new perspective. He might discover secrets about Royal Woods that no one else knew, and use his new - found knowledge to make the town a better place.
One possibility is that Lincoln could get super strength. He might use this power to protect his family from various threats in Royal Woods. For example, he could stop a runaway car that was about to hit his sisters.