(CNN) A family of six was discovered inside a remote farm in the Netherlands, where it is believed they lived in isolation for nine years, according to CNN affiliate NOS.

The father and five children, ages 18 to 25, were found in the small village of Ruinerwold, in the northeastern province of Drenthe, Dutch police told CNN. A sixth adult child had left and was the one who alerted police.

Although the village has just a few thousand residents, no one knew the family was there.

Police arrested a 58-year-old man who rented the property. Authorities said they are still trying to determine the link between the detained man and the family, and they believe the family has been living there since 2010.

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