Gastrophobia

Gastrophobia is a webcomic by Daisy McGuire. It follows the adventures of Phobia, a single Amazonian mother, and her son, Gastro, as they traverse the ancient Greco-Roman world.

Unecessary Surgery
Phobia is "charmed" by a doctor who plans on using her in an attempt to surgically create a mermaid. He similarly "charms" Gastro to keep him from protesting.

Trivial Trivia with Trivia the Sphinx
Trivia educates the reader on Sirens.

Oh, Baby! You Devil.
Phobia suggests a mind altering spell as an explanation for the duplicate babies the family has found themselves with.