Sylvia's girlfriend Mindy Jory, a legal receptionist in Mildura, shared a picture of Sylvia with her and her son, captioning the image with only a heart emoji.
Sylvia spent 11 years playing in the AFL for Melbourne and the Fremantle Dockers and was the former's leading vote-getter at the 2010 Brownlow Medal awards.
Sylvia has also had somewhat of a troubled few years.
Late last year, he pleaded guilty to filming his former partner sleeping after breaking into a vacant nearby apartment, just two days after being court ordered to not contact her.
Police said Sylvia had breached the court order four times in the 48 hours after it was issued.
Less than a year earlier, the football player had fallen from a balcony, injuring his head and neck.
In 2006, Sylvia faced court and was ordered not to assault, harass, threaten or intimidate the woman he had been dating following an early-morning incident.
He also faced legal issues in 2011, when a car he was riding in as a passenger hit a power pole and he left the scene.