updated 05/06/2010 AT 1:00 PM ET
•originally published 05/06/2010 AT 2:30 PM ET
According to sources in Sweden, Nordegren and her mother Barbro Holmberg together celebrated the Swedish holiday of Valborg, which on the last of April marks the arrival of spring with elaborate fires, singing and partying amid the beautiful landscape of mild weather.
“During the holiday, Elin was seen walking the streets of Gävle with her mom and children,” a source tells PEOPLE. “But she has had special protection by bodyguards 24/7.”
Last Friday, on Valborg, the wife of Tiger Woods left her digs in Stockholm with the children to travel north and enjoy the holiday at her mother’s large apartment in the Gävle. She was photographed jogging along the river Gävlean, and brought the children along on several excursions.
“The security around them was huge,” the source tells PEOPLE “The family is being driven in dark cars with tinted glass.”
According to a published report in Sweden, when Nordegren and the children were inside of the castle, the guards were on duty outside.
On Monday evening Elin and the children said goodbye to Holmberg and returned to Stockholm to prepare for their flight back to Orlando.
“The next few months will be very interesting in the life of Elin and Tiger Woods,” a source tells PEOPLE. “Despite all of the gossip, the most important thing to Elin is the fate of her children.”