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The absence of the comma means Bert and Ernie are brothers and their mom is one of those ladies who married herself, which was a trend for a moment in like, the early 2000s or something.
There’s no place to grammatically put a comma for disambiguation, but if you switch around the subjects you can clear things up:
Ernie’s mom and
BurtBert?But now you’ve introduced a fourth person, Burt, distinct from Bert, which has made for a somewhat confusing orgy.
Damnit! How am I supposed to be a grammar snob if I can’t even spell his name right?
Hah, I definitely forgot about that trend, it was pretty short lived.