Upvote:2
You're using the wrong application form.
He needs a Standard Visitor visa, which you apply for HERE.
Select "Visit or transit visa". You won't have any sub-types to choose from.
Upvote:2
If you're having a child together, then you're definitely family. Trying to claim that as "tourism" could at worst be seen as deceptive, with disastrous results -- not so much if he is otherwise candid about his plans in the application, but it certainly won't help the application's chances.
The form is not not asking because there are particularly lenient rules for family visits that he would need to qualify for in some technical legal sense -- merely to give the ECO an early idea of which kind of explanation for why he wants to go the application and his documents are supposed to add up to.
Still, even if he does everything right, expect that they'll be rather suspicious whether he really intends to become a father while in the UK and then just up and leave when his visa runs out. Be sure to have a clear and convincing explanation for that ready, and that this explanation is evident in the application.