His mum Panayoula Kontoyannis - whose father is Greek, meaning he is eligible to represent Greece as well as Belgium and Gambia - celebrated her birthday on the day that Ton clashed with Saints.
Cham netted twice, giving Ton the lead with a close-range finish in the first half before wrapping up the win by crashing home the fourth, and has told how he had guaranteed his mum a goal.
The 20-year-old told the Tele: "It was my mother's birthday on the day of the game against St Mirren and I promised her I would score so it was very nice.
"My mother raised me on her own so she didn't get to come and watch me much previously because she was very busy in the house. I was going on my own to play football.
"But now everything is going very well so I will invite her over when the season starts. She loves Scotland. She always told me it was a nice place with nice landscapes."
Meanwhile, the SPFL launched their new brand at Hampden yesterday and revealed the new names of Scotland's four divisions - all of which have been modelled on the English equivalents.
Morton will compete in the new Scottish Championship while the top flight has been renamed the Scottish Premiership.
The Second and Third Divisions have been rebranded as Scottish League One and Scottish League Two.