More than two months after four children were found dead inside their grandmother’s New York home, a newly released toxicology report is revealing another disturbing layer to the tragedy.

Harper Harmon, 13, Hudson Harmon, 11, and 10-year-old twins Gavin and Gracelynn Harmon were found dead at a residence in Mechanicville on June 23.

Police later concluded that the children had been killed by their mother, 44-year-old Sarah Myers, and their grandmother, 64-year-old Amy Steadman, before the two women died by suicide.

Now toxicology findings shared by Mechanicville police show that all six people had a potentially deadly amount of a common over-the-counter allergy medication in their systems.

And four of them also tested positive for mitragynine — the primary active compound found in kratom, a substance that has drawn increasing concern from federal authorities.

The new findings provide investigators and the public with a clearer picture of what happened inside the home, although police are still withholding some individual toxicology details.

All Six Had Diphenhydramine in Their Systems

According to a summary of the toxicology report provided to PEOPLE by Mechanicville police, all six deceased individuals had a fatal or lethal concentration of diphenhydramine in their bodies.

Diphenhydramine is an antihistamine widely available without a prescription and commonly found in medications such as Benadryl.

The toxicology results mean the drug was present not only in the four children, but also in Myers and Steadman.

Police have not publicly released the full individual toxicology reports, meaning authorities have not identified precisely which person had which combination of substances.

But the report provides one crucial conclusion: poisoning was part of what happened inside the home.

The findings are especially significant because earlier information about the case had already indicated that at least one of the children suffered another form of violence.

Police confirmed that Gavin, one of the 10-year-old twins, had also been stabbed.

The toxicology results now show that he was poisoned as well.

Four People Also Had Kratom Compound in Their Systems

Investigators found another substance in four of the six deceased individuals.

Toxicology testing detected mitragynine, the main active compound found in kratom.

Kratom is derived from a plant native to Southeast Asia and has sometimes been sold in convenience stores, smoke shops and gas stations, leading to the informal description “gas station drug.”

The U.S. Drug Enforcement Administration identifies kratom as a “Drug and Chemical of Concern.”

At higher amounts, the substance can produce sedative effects and effects resembling opioids, according to Yale Medicine.

However, police have declined to disclose which four people tested positive for mitragynine.

That means it is currently impossible from the publicly released information to determine which children or adults had both substances in their systems and which had only diphenhydramine.

That distinction may eventually matter for understanding the precise sequence of events, but authorities have so far chosen not to release those details.

Police Discovered the Family During a Welfare Check

The tragedy came to light on June 23 when police responded to Steadman’s Mechanicville residence for a welfare check.

Inside, officers discovered the six bodies.

The victims included all four Harmon children along with their mother and grandmother.

Investigators subsequently determined that Myers and Steadman were responsible for killing the children before taking their own lives, according to police.

The discovery immediately prompted questions about what might have happened in the days and hours before officers entered the house.

But another painful detail soon emerged.

The children’s father, Brady Harmon, had reportedly been trying for years to obtain custody of them.

Their Father Was Expecting Them in Utah

Brady and Myers separated in 2019, according to reports cited by PEOPLE.

In the years that followed, Brady said he pursued legal avenues in an effort to gain custody of Harper, Hudson, Gavin and Gracelynn.

By the summer of 2026, he believed he was finally approaching an important turning point.

The four children were reportedly scheduled to travel to Utah beginning July 1 — just eight days after they were found dead.

Brady said the plan was for them to spend the summer with him, reconnect with relatives they had not seen and meet other family members for the first time.

Instead, they never made the trip.

Brady later described having exhausted the options available to him and his lawyers as he attempted to change the custody arrangement.

He said he had never imagined the situation could end in such catastrophic violence.

That timeline has made the case especially haunting.

The children were days away from what their father expected to be a long summer visit when they died.

Toxicology Answers One Question — and Raises Others

The toxicology report provides the clearest medical evidence yet about one component of the killings.

Investigators now know that all six people had lethal levels of diphenhydramine in their systems.

They also know that four had mitragynine.

But significant questions remain unanswered publicly.

Police have not identified which four individuals had kratom’s active compound in their systems.

They have not released separate toxicology reports for each victim.

And the publicly available report does not fully explain the sequence in which the substances were administered or how the events inside the home unfolded.

Those limits are important.

The new report adds facts to the case, but it does not justify speculation about details investigators have not disclosed.

What it does establish is that poisoning was not confined to one child or one adult.

Every person found inside the house had the allergy medication in their system at a lethal level.

Four Children at the Center of the Story

The medical findings are shocking, but the central loss remains the four children.

Harper was 13.

Hudson was 11.

Gavin and Gracelynn were only 10.

Their deaths ended a custody struggle their father believed was nearing a new chapter and erased the summer he had expected to spend introducing them to relatives and rebuilding family connections.

For Brady, the legal fight he had pursued for years did not end with the reunion he hoped for.

Instead, he was left facing the task of bringing his children’s remains home.

The toxicology report now offers authorities another piece of the puzzle surrounding what occurred in Mechanicville.

But it cannot answer the question that often follows tragedies like this one: why four children who were preparing for a summer with their father never got the chance to leave.

For investigators, the report helps explain how they died.

For the family left behind, it may only make the final hours of Harper, Hudson, Gavin and Gracelynn even more difficult to comprehend.