Pour the Irish whiskey, peach schnapps, and sour mix into the shaker.
Shake for 30 seconds.
Strain evenly into 3-shot glasses.
Add an ounce of lemon-lime soda over the top. You can do more or less depending on how you like it.
Notes
Use American whiskey if you don't have Jameson. Add more or less soda depending on what you like. Make sure to shake the cocktail for 30 seconds to dilute it. Add a garnish like a lemon or lime slice.