Former Catalan premier Jordi Pujol and three of his children have had their homes raided by the Spanish National police.
They are under investigation for alleged tax fraud and money laundering.
Several business premises have also reportedly been searched.
Pujol’s eldest son, known as Junior, is believed to have gained lucrative contracts from the regional government thanks to his father’s position in power.
Another probe is ongoing into the origin of the family’s fortune.