Incest (potential or otherwise) is a near-taboo subject on soap operas today...
...but the then-brand new genre of romance comics took several cracks at it back in the 1940s.
Note: this never-reprinted tale from Timely Comics' Actual Romances #1 (1949) makes the brother and sister step-siblings, just to be safe.
Though the Grand Comics Database lists Mike Sekowsky as the artist, it looks a lot like a combination of Werner Roth and Bill Everett, both of whom were working for Timely.
The writer is unknown.
We haven't decided yet what it'll be, but we can guarantee that...
You'll Cry Your Eyes Out if You Miss It!
(Oh, you've heard that, eh?)
And now a word from out sponsor...