The Splinters are completely neutral in character and thus cannot affiliate themselves on that level with any clan or vampire beyond their own clan. Instead, roleplaying communities are formed, and respects are paid by OOC acknowledgement.
Gehyra - also currently our primary OOC allies - have a nice little writ on what an OOC alliance is if you're curious about the details.
For up to date interclan information go to the forum's Illumination section.