I was wondering if a Dremora could reproduce? If so could they have a child that is half Man (Human, Mer, or Beast)?
I had this idea that in the next Elder Scrolls game they could make the main character a half dremora half "Race of your choosing" bastard child who can speak to both daedra and man... and the whole MQ could be about how there are more half dremora people who have hidden themselves from society and after being driven from their homes underground are now trying to introduce themselves into society but ever sice the oblivion crisis (many dremora would have [censored] women during invasions and the mothers could have been banished because of the child that was thought to be evil dwelling inside their wombs)
I think that being raised by a mother who showed them love and compassion might make them lose their inherent evil nature since their tie to the daedric lords would have been severed.
The storyline could be about how stendars worshipers (without his consent) want to destroy the "unholy bastard children of demons" while the rest of the world (most of them anyway) believe that the half-drems are more man than they are dremora and only their appearance makes them different from the rest of the men and women of tamriel

Daedra cannot reproduce to my knowledge. Not in any conventional way. The whole concept of Daedra is that they're the beings who refused to participate in Convention/Creation because they see acts like reproducing and cutting pieces of themselves off to be demeaning and wasteful. It's the essential ideological schism between the Daedra and the Aedra and their offspring. We have at least three references to Molag Bal fathering monsters, although this is probably not reproduction as we understand it. He cursed the girl Lamae Bal into being a Vampire. His "daughter" in Morrowind was a Winged Twilight. In this context I believe she was his "daughter" because he favored her and adopted her. It was said he fathered monsters with Vivec, but Vivec was a divine hermaphrodite and nothing about him/her was normal, so it's entirely possible the Daedra's corrupting influence caused Vivec to asixually reproduce in some strange fashion. It should also be noted that this specific instance is from a religious book that was written to depict Vivec in a slightly more heroic and obscure light than the reality of his past, so the entire story could have been metaphorical.

but the spider lady things in oblivion had babies
they were just lesser daedra

Daedra cannot be created or destroyed. However, they can be banished into the void of Oblivion, and if another Daedra (or a mortal) summons that Daedra back into one of the material planes of existence, then the summoner might be thought of as that Daedra's "parent." But obviously its more of a sort of a bondage/servitude kind of relationship.