Hi Ipotato and welcome. From your answers you could have something in your home. I would look to the newest change which is the elephant. Sometimes spirits or entities can attach to a material object. I’m not saying it’s your relative, but it may have had an attachment when your granddad had it. I would see if your dad would mind you taking it out of the house to see if you get relief from the activity. If it’s really sentimental there are ways of storing these objects but let’s figure out the cause first by eliminating things.
Remodeling or making structural changes to a home can sometimes stir up dormant energies or spirits. You mentioned a remodel
You also mentioned using a Oujia board. This can open a portal and you could have brought something home. However you mentioned that was a long time ago. So I don’t know if it’s that.
Anyway what to do? I’m sure you will get many suggestions here so you will have to decide. I suggest first get the elephant out of the house to determine if that is the problem. If the activity continues, talk out loud to the air in a firm manner. Claim your home (this is something you father should do probably as head of the household ), demand this thing to leave that this is your space and time. Sometimes that is all you need to do. Claim your space. I do not recommend any other communication. If the activity continues take it up a notch to burning sage or palo santo wood to smoke the house. You must get every closet and corner once this is done you can seal your home entrances (doors and windows ) with holy water. This creates a boundary of sorts. If done right this clears most negative energy. Any Catholic Church will have holy water. No if you have problems after this it’s time for help and you should send a personal message to the proprietor here Debi.
If you are of a faith in God I will recommend the st Michael prayer of protection. I’m having problems with my phone so I can’t post it at the moment. I’ll ask others here to do so. Keep us posted.