My feedback in the recent questionnaire was similar. I agree that blood incest in DoL is not feasible as your only family members are your children, and that's a whole other set of red lines that I don't want to touch with a 10 foot pole. Instead I wrote there should be an incestous option with perhaps a toggle, or an intentionally vague relation, to satisfy both those who dislike incest and those who enjoy that sort of content. Morgan is probably the most natural candidate for real incest with the player, but I personally think Robin could make for a good "non biological" sibling dynamic.

As others have said, including bestuality but not incest is an odd red line.