you have the colours and meanings of light right. i don't know what stones you are using but something like amethyst if you want to be more conscious of the problem, obsidian (from memory) if you want to deflect it.

burning sage turns negatavity (years of it potentially) in the house into something more objective and valid.

best advice i can give is, get to know the problem (his mind), the people involved, and formulate a resolution that is beyond doubt ie is based on truth and not fear. eg he might be lying to himself and see through that, rid such a lie in yourself. you'll grow thru this , most probably in such a was as to understand "higher" forms of innocence indeed even protection. you could also cast a mirror bubble around his aura. good luck o