The sign said "NBA Miami Heat Star Mother Of His Children On The Streets."
A Deadspin source said he overheard Funches ranting about "$90 million contracts" and "houses on the water."
Funches filed suit earlier this month in Cook County Circuit Court, saying that Wade was not depositing endorsement deals into a joint account, as required in a 2008 agreement.
In a 2010 suit, Funches sued Wade's girlfriend Gabrielle Union for $50,000, alleging Union was causing her children emotional distress. Funches alleged that Union "engaged in sexual foreplay" in front of the boys, and that they were allowed to play around a pool unsupervised.
Funches and Wade got a divorce in 2007. Wade was granted sole custody of their children in March 2011, and Funches faced kidnapping charges in June 2012 when she refused to return the boys.
NBC reportedly holds celebs hostage to Jimmy Fallon's show
Ray Liotta sues skin care company over use of likeness