My brother and sister has came into my dad's life after my mom passed away and completely brainwashed him.

They took his money and put him in a nursing home. That is around 10k each month. So if his care is being paid for, then what evidence do you have to claim fraud and abuse. As far as car ownership, the car cannot be gifted. All $$$ goes for his care.
What is your part of the story?

If you suspect elder abuse I would discuss this case with APS in your area; Adult Protective Services. As you can imagine, we haven't a clue what happened here. Wishing you the best and so sorry for loss.

That sounds incredibly tough. Losing your mom is already hard enough, and then having to deal with family tension on top of it makes things even more painful. Sometimes people show up with their own agendas, and it’s heartbreaking to watch someone you love be influenced like that.
In situations like this, staying grounded and keeping track of what you can control really helps, kind of like how I regularly do a SASSA Status Check just to make sure nothing’s slipping past me. Wishing you strength and clarity as you navigate this. You’re not alone.

When elder abuse is suspected your local Adult Protective Services will listen to your concerns and possibly decide to investigate the situation. Call them