Get Your Sibling and Get Better Together
This is a common fielding drill that is simple yet extremely effective. While this may seem monotonous and boring, there is no better way to develop hand-eye coordination and begin feeling how the hands work when fielding. I like to shut the lower-half off in this drill by working from a kneeled stance. All the fielder needs is a ball and a partner (a wall will also work).
The goal is to mimic fielding the last hop of every ground ball. One thing to keep an eye on is that the fielder is taking his hand towards the ball and not swiping up or funneling into their chest/stomach. The emphasis is to secure the ball out in front and be able to adjust to different thrown hops.