Thank you for sharing your dream with us. Please accept my condolences as it pertains to your son and I hope that the pain of his loss has lessened. Please take everything that I share to the Holy Spirit as He Alone gives the accurate interpretation.
I only feel led to comment on the tree and the living environment. I think that is the main issue and perhaps some deliverance/and spiritual cleansing needs to be done for that house and tree. Perhaps, hew the tree down. Something is not right and might be buried around that tree or ungodly activities transpired there in the past.