I think that they might be the person that the father had an affair with because shes a psychiatrist and she seems to have some sort of knowledge on the mental state
I think Gluttony might view Maru as its own child or something of the sort since it has been with Maru since he was a kid and killed his father (?) for maru
I think that they might be the person that the father had an affair with because shes a psychiatrist and she seems to have some sort of knowledge on the mental state