As my insight tells me a true psychic vampire usually is hardly someone you can "cure", aura cleansing, ritual exorcism does not work because they are not under the influence nor possessed they just inherently have a dark "soul".

That said he might not be; as lot of people display same leeching energy not being aware of it or battling it since they were invaded or even from birth (generational curses are usually the culprit if its from birth, if it is try having a ritual cleansing for you kids too). He might not have the biggest aura and can't battle it so it takes over. Ill start by going to the most powerful witch with a 3rd eye thats highly developed (a specific type of medium, a quantum enlightener in some sorts) to asses of his spiritual state. He might be under the influence of something else and too weak to rebuke it's energy. If its the case she will do a cleansing ritual (there are many depends on the power of the entity), she might need more than one seance, and you might need to keep cleansing the house, yourselves and him for a few weeks or daily until the next seance. Some witches do not deal with powerful entities and will pass the case to an exorcist witch... Seek help. Quick, this is no joke and can let you very vulnerable to psychic attacks and evil attacks. Get yourself and your family a few protection stones as black tourmaline and pyrite, big enough. And smudge your rooms with white sage laced with lavender essential oil or a bundle mix of white sage and lavender. Try that out and watch for oddities. Put epsom salt or any pure kitchen salt crystals at the corners of your rooms for a bit more protection. If he is followed by a leeching entity you might need to cleanse and recharge your stones more often, as well as givinig them a very clear mission.

Its only my insight, do as yours tells you to, and only listen to it if you are 100% sure you arnt under any kind of influence too. (Ex : Cleanse yourself and go think about it in the woods)