Have followed this thread from the start & been thinking about the putative father of this baby. Given DSD's unwillingness to name him, & given that OP says she was known to be studious I wondered about a teacher? I know, I know - it's pure speculation based on nothing, but given how keen DSD seems to be to 'protect' him, I just wondered . . . .
I also have a DD of 14 & have been reporting this thread to DH as it progresses. I'm as certain as can be my DD isn't sexually active, but it sounds like Tess was too - am definitely going to have a 'sex, pregnancy & contraceptive' talk with my DD asap!
Tess, my heart goes out to you, your DH (I have faith that he'll earn the 'D' back pretty soon, as others have said he just sounds panicked and not thinking straight. It sounds like his caveman 'Ug, must protect daughter' brain is overriding his rational thinking & bigger picture brain right now.) and your DC's - all of you. Hats off to you for staying rational & reasonable through this trial. I'm in such admiration & can't tell you how much I'm rooting for you.
Thanks to all you other Mumsnet posters too for such sane, sound advice (mostly!) and sensible opinion. I know where I'll be coming if I need advice in future.