Oksana Wants $500k from Mel For 'Trauma' to Her Son

Oksana Grigorieva made it clear to the family law judge Friday -- she wants a bundle from Mel Gibson, including a half a million bucks for the alleged trauma she claims Mel caused her 14-year-old son, fathered by actor Timothy Dalton.

TMZ broke the story ... Mel and Oksana met separately with the judge and a mediator Friday, trying to hammer out a settlement in the custody war that is laced with financial overtones. We're told Oksana asked for a huge amount of money for various reasons, and one involves her son Alexander (aka Sasha).

Oksana claims Mel traumatized the boy during the January 6, 2009 explosive fight, which ended with physical violence .... Oksana has alleged Mel knocked two of her teeth out, while Mel says he merely slapped her because she was out of control and endangering the baby.

Oksana claims Mel was abusive to Sasha during the argument, calling him names and scaring him so much he allegedly hid under the bed.

Oksana also claimed on another occasion Mel threw her son onto a table, but Mel's camp has denied it.