While Sofia Vergara has remained silent on her engagement to Nick Loeb, someone else in the family may have finally confirmed the news: Her son, Manolo Gonzalez.

The 19-year-old has been releasing a series of YouTube videos about Sofia's big 40th birthday bash in Mexico ... and the one he dropped yesterday includes shots of the alleged proposal!

The latest video chronicles the group's trip to the Mayan ruins of Chichen Itza, where "Once they were to the top of the pyramid, my mother's longtime boyfriend, Nick, proposed to her" -- at least according to Manolo.

Vergara proudly shows off the giant ring in other portions of the video, though she never says anything about the proposal or being engaged.

Do you think he really popped the question ... or was the ring just a very nice birthday gift? We're leaning towards engagement.

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