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What happened to William I’s estates and his son Philip William after the duke of Alba took power?

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Portrait of William I, Prince of Orange, by Adriaen Thomasz Key. He wears a dark embroidered coat, a white ruff collar, and a black cap, with a trimmed beard and mustache. — William I Portrait of William I, oil on panel by Adriaen Thomaszoon Key, c. 1579; in the Rijksmuseum, Amsterdam.

When the Duke of Alba arrived in the Netherlands and established his reign of terror, the consequences for William I, Prince of Orange, and his family were severe:

Confiscation of Estates: Having anticipated the Duke of Alba’s arrival, William managed to escape to his birthplace in Nassau-Dillenburg. Consequently, all of his possessions within the dominions of King Philip II were promptly confiscated by the authorities.12
Imprisonment of Philip William: William’s son, Philip William, who was a student at Leuven, was taken prisoner and deported to Spain.12

These actions were part of the broader repressive measures enforced by the Council of Troubles, which Alba established to suppress rebellion and heresy through widespread executions and property seizures.12