According to her sister, Amy Sharp texted their mother the next day to say they'd reached Tulum.
Jana Weland, a relative, told CNN the family arrived in Tulum on March 15.
Investigators say the bodies of an Iowa couple and their two children have been found in a rented condo in Mexico.
On Friday afternoon, Peterson posted an update. "We are extremely anxious and hope they are found soon or can contact their family", she added. "Thank you for all the posts, shares, and kind words".
An Iowa family members was discovered dead in their condo while vacationing in Mexico.
When the Sharp family didn't show, relatives filed a missing person's report.
A statement on the website said: "While most of these homicides appeared to be targeted, criminal organisation assassinations, turf battles between criminal groups have resulted in violent crime in areas frequented by US citizens".
It's not known what killed the family of four. They also said that no foul play was suspected in the deaths.
The family had gone on vacation to Tulum, on Mexico's Yucatán Peninsula.
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"We would like to express our sympathies to all family and friends of the Sharp family".
"To my knowledge, they went to sleep and never woke up", Ms Weland said.
When they failed to arrive they were reported missing to local police Thursday, she wrote. They were staying in a rental house they found through a vacation rental company.
About a week later, on Thursday night, the family had a sinking feeling that something wasn't right.
She stated on Facebook that the family left for Mexico on March 15 and was expected to return to St. Louis Lambert International Airport on Wednesday. They were scheduled to depart from the Cancun airport on Wednesday and fly to St. Louis on a non-stop flight. "They were to be here watching us play basketball this week", Lorensen said. It pinged in Mexico, Hoyt told the Creston News Advertiser.
A new security alert was recently issued by the state department - for that part of Mexico after an explosion on a tourist ferry in Playa Del Carmen. "While most of these homicides appeared to be targeted, criminal organization assassinations, turf battles between criminal groups have resulted in violent crime in areas frequented by US citizens".
A spokeswoman for the attorney general's office said by phone that autopsies could be completed as soon as Friday night. During the initial inspection, there were no signs of injury or violence on the bodies or in the room, according to a Facebook post.
Paulina Chávez Alonzo, a spokeswoman for the Mexican Embassy in Washington, told NBC News that the government offered its "deepest condolences to the family and friends of the Sharps".
"There appears to be no signs of trauma", Ver Meer said. "It's hard to talk about". "He's a big part of that community there".