Looking up TWH pedigree requires being a TWHBEA member and also paying to have access to "IPEDS".
Someone that pays for both of those expensive privileges can help you and that would not be me.
My Boys are all registered and I made sure to pay for their papers to go back quite a few generations but, I dropped my TWHBEA membership a long time ago. Therefore if I can't even find out about brothers, sisters, or show records.
Good luck in your search