In a tragic incident in Tennessee, authorities report that a mother took the lives of her two sons, aged 4 and 13, and her 88-year-old grandmother before ending her own life.

The Humphreys County Sheriff’s Office was called to a residence on East Little Richland Road in Waverly, approximately 75 miles west of Nashville, on Friday for a welfare check. Deputies discovered four deceased individuals inside the home.

During a press briefing, Sheriff Chris Davis explained that preliminary findings suggest 32-year-old Heather Thompson fatally shot her sons, Isaiah Thompson, 13, and Arius Thompson, 4, along with her grandmother, Evelyn Thompson, before committing suicide.

“I am personally acquainted with the family,” Davis stated, according to a report by ABC affiliate WKRN. “Our priority is to honor and show respect to them in every way we can.”

While the motive remains unclear, Sheriff Davis noted that Heather Thompson had been separated from the father of Isaiah and Arius.

Biah Thompson, the boys’ father, shared his thoughts on the incident in a comment on the sheriff’s office’s social media post.

“I miss my sons already,” he wrote. “Daddy still loves you. Sorry I was at work.”

In a Facebook post where he asked for funds to pay for funeral expenses, he said he received a call Friday morning he “wouldn’t wish on any other parent.”

“As a father it hurt and shattered my soul to hear my sons, Arius (Ari) and Isaiah have been taken from me and are no longer with us. They were just babies. Every second of today I wish I could just wake up.”

Davis said deputies have not responded to the home for domestic or mental health-related calls prior to Friday.

Heather Thompson worked as a nurse practitioner at a local hospital, the New York Post reported.