Paranormal Case

I am a demonologist who has done many cases in reguards to house hautings, succubi, attachment etc. Just a question. I have cleansed a house and yet this spirit (tall dark and animalistic) follows different members of a family. I have sealed a house but not all of them.

Questions: Fould this be a ancestry curse maybe?
Or just a spirit that everyone needs to banish and let go of an idea or something poisonous to them
Or just have all houses needed to be sealed?

I kinda know who I think it is but wanna hear what y’all think! Thank you for your time to read the question!