Wait — what?!
So many questions.
To clarify: You have a partner, who is your SON’S FATHER (also your daughter’s?) and somehow he is completely oblivious to all this, and you are:
Hyper-aware and continuing to focus upon your adult son’s hygiene habits, coffee drinking, and $25 herbal supplements?
Witnessing your 18 yo daughter receive threats of rape and sexual violence and unable to intercede in a meaningful way, or create a safe environment for her or get her help?
Unable to convince her father that she’s in an unsafe home despite her conviction she’s better off dead?
Somehow more concerned about the mystery of the $25 herbal supplement than the rape threats?
Somehow more concerned about the hurtful “dumb immigrant” comments than the imminent suicide and complete lack of psychological safety in your home?
Perhaps because presenting petty red herrings with seriously disturbing indications of psychopathy/a break with reality on the part of your son, which present a clear and present danger to your family, particularly your daughter, are muddying the water here!!
Maybe he’s been hurting her for years!
Sort yourself out and call a mandated reporter, such as a social worker at a school or hospital right away!