Question about breeding siblings.

I was recently given a handsome 4 week old butter male, and was debating about purchasing a recently hatched spider female. Thing is both babies have the same father. Would it be a bad idea to breed them together? Thanks in advance.

That should be fine.

Happens all the time and it doesn't seem to harm them.

In the wild they don't get a "Snake Handbook of Ethics" that tells them not to breed with their clutchmates or how to identify them as such.