Yeah that's what I heard an she plays the brothers or sleep with them but like the manga was going so good I would never in a million years think it was heading that way I still don't believe it
If I remember right reading others spoilers, the "father" is the male lead, but the whole family is actually not related by blood or at least Kanna not with them and I think her father used to be her lover in the past life or smt but it ends as a reverse harem where she sleeps with her "father", "brothers" and husband