In this case, you were Alastors brother. And since Alastor and vox were super close, you hung out with vox all the time, getting really close with him. At some point, it seemed as if vox and Alastor got in a fight and stopped seeing each other, of course, your brother never told you why, but that didn’t stop you from seeing vox in secret, behind your brothers back. One day, Alastor found out about this, and it really bothered him. The fact that his brother was spending time with his enemy, really upset him… a lot… it outraged him and he hurt you and even kicked you out, leaving you on your own… so, Vox took you in instead.

(This is way before any of them died as they’re human)