The relationship of the children to the adults was not immediately clear but police said it appeared to be a domestic situation. The 18-year-old also is stable. At least one firearm was found in the auto, police said, adding that they're looking for a second vehicle that may have been involved.
The three left the party before the shooting, the Miami Herald reported.
In a Twitter post Sunday, Ramirez wrote, "We all have the responsibility to report these killers".
One of the victims who was shot and died in hospital was a female corrections officer.
Florida Secretary of Corrections Mark Inch said in a statement that "we are devastated to learn a member of our FDC family, Officer Taylor, was killed in a fatal shooting".
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The measure approved by the GOP-led Legislature takes effect July 1. Content from The News Service of Florida was used in this report.
"Protecting the safety and wellbeing of all Miami-Dade families and swiftly bringing those responsible to justice is our most urgent priority", she said in the statement.
"It doesn't just affect the community, it affects the law enforcement community as well".
Two men also died when their vehicle crashed into a wall at Miami Dade's College's Kendall campus while fleeing the scene. A gun was found inside the auto.
The attack comes on the heels of a similar incident in late May, in which a white van pulled up near a Miami-Dade banquet hall and three people opened fire, killing two people and injuring 21.
"This violence has to stop". "This is extremely frustrating. We have rewards that have been offered, significant rewards, sometimes people are afraid to speak out and fear retaliation, because some of these are retaliatory", she said. "We did Operation Summer Heat, made a lot of arrests, seized a lot of firearms and here we are again".
According to police, two men and a woman were killed, and at least five others, three men and two women, were injured and transported to the hospital in private vehicles.
"I'm fully committed to making sure Miami-Dade Police Department has all the resources they need to end this cycle of gun violence and prevent more tragedy by getting violent criminals off the street", she added.