On Monday, a judge sentenced Tristan Potts to 25 years for second degree murder, 15 years for armed criminal action and 7 years for attempted arson. Those sentences will run concurrently.
Potts will serve part of his sentence in a youth services facility in Montgomery City.
He plead guilty to the charges back in December to the 2015 death of 12-year-old Teresa Potts. Police arrested Tristan Potts after he fled into a wooded area near the home where the shooting took place.
The siblings had been adopted by the family who lived at the home.