as funny as the whole mabel grilling ford about his thing with bill is, i fully believe that girl is oblivious when it comes to actual relationships that aren’t fairytale romances. she’s twelve, not her fault. also, most of what we know about ford’s relationship with bill comes from ford himself, and dipper was the one who hung out with him the most and read the journals religiously. however, he’s also twelve. so i think that the most realistic way dipper and mabel find out about bill and ford’s toxic situationship is just. dipper hearing ford complain about bill in the lab and then like four years later sitting bolt upright in the middle of the night and going. Oh My God Grunkle Ford Fucked Bill Cipher.