MONTREAL - The mother of late boxing champion Arturo Gatti says she found her future daughter-in-law's behaviour abnormal the first time they met.

Ida Gatti took the stand this morning at a civil trial aimed at deciding who will get her late son's fortune.

Ida Gatti says her son sought to reassure her after that March 2007 meeting. She says she later grew fond of her daughter-in-law Amanda Rodrigues and found her charming. She says the latter, eventually, called her "Ma."

She says Rodrigues once told her she loved Gatti and said Arturo was her life. But as the relationship went on, she said, the arguments between the pair became more frequent.

The Gatti family is now battling Rodrigues in court. It wants to have a will that was signed just three weeks before his death -- which left everything to Rodrigues -- declared invalid.

In 2009, three weeks after Gatti was found dead in a hotel room in a Brazilian seaside resort, police ruled his death a suicide.

A private investigation into the death commissioned by Gatti's former manager contradicted those findings and called his death a homicide.

Brazilian authorities have agreed to take another look at the case.