I'M Unsure About My Wolves' Pasts

Blanca is my wolf, and Caius is my dark wolf. I don't know much about Caius because I try to keep him sealed up inside. Whenever I try to remember Blanca and Caius' past. (I think they were brothers.) I get this vision of them suckling two white wolves. Blanca was suckling his mother, (Of whom I do not know the face of.) and Caius suckled another white wolf that I am not entirely familiar with. Caius and Blanca seemed to get along, but Caius did have darkness in his heart. I think at some point, he abandoned his pack, and started causing trouble... (When he was maybe 15 or 16 in human years.)