Thailand's top court has banned the lawmaker niece of fugitive former premier Thaksin Shinawatra from politics for five years for a false financial declaration, a court official said Friday.

The Supreme Court handed Chinnicha Wongsawat, a member of parliament for the ruling Puea Thai party, a two-month suspended prison term and a fine of 4,000 baht ($130) in its ruling Thursday. The party said it would appeal the verdict.

Chinnicha, the daughter of former prime minister Somchai Wongsawat, was accused of failing to disclose a debt of 100 million baht ($3.2 million) when she became a lawmaker last year.

Thaksin was toppled by royalist generals in 2006 and lives in Dubai to avoid a two-year prison sentence for corruption that he contends is politically motivated.

His sister Yingluck Shinawatra became prime minister last year after a resounding election victory by the ousted premier's political allies.

Mass rallies by Thaksin's supporters in the Thai capital in 2010 descended into the kingdom's worst political violence in decades, with more than 90 people -- mostly civilians -- killed in a military crackdown.