No to brother & sisters...
Father and Daughter is OK.
I have researched this with AKC years ago. AKC will accept only Father & Daughter.
I personally will not inline breed.
I do not think it is politically correct.
Breeders who show do, do this.
Me personally, No
There are some threads under "Breeder Talk" that this subject is about.
YT Members here had alot of good info on this subject, check it out.