All members of a Delaware family fell seriously ill during a Caribbean vacation. According to a report on ABC station WPVI-TV, school administrator, Steve Esmond, his wife, Dr. Theresa Devine, and their two teenage sons were on a vacation in March.

The family might have been exposed to the pesticide methyl bromide at the Sirenusa Resort on St. John in the U.S. Virgin Islands, states the report.

According to Judith Enck, Administrator for the Environmental Protection Agency's (EPA) Region 2 Office, the day the family arrived at the resort, the apartment below them was sprayed with methyl bromide to kill indoor bugs.

The pesticide was sprayed on March 19, during the daytime, Enck said. By the night, the entire family started having adverse health effects. Both the teenage boys had seizures, said Enck.

The family was immediately taken to a nearby hospital on neighboring island St. Thomas. The boys were then airlifted to a hospital in Philadelphia, Enck said. But the parents were airlifted to a hospital in Delware.

According to the EPA, methyl bromide exposure can have short-term and long-term effects including severe lung injuries and neurological impairment.

Enck told ABC News that the EPA banned methyl bromide for indoor residential use in 1984, but the product is still available in the market for agricultural use.

Steve Esmond and his two sons are still in very critical condition, Enck said today. He further said that Devine is out of danger.

Steve Esmond is the head of the middle school at the Tatnall School in Wilmington, Delaware, according to the school's website. Devine is a dentist in Broomall, Pennsylvania, according to the company website.

Oliver Campbell, a peer of one of the boys, told WPVI-TV, "They're just one of those families that everyone loves to be around. It's just horrible".