Even then it helps not to expect people to change their mind right there. Especially in the case of relatives with weird ideas, it can be helpful to not go into

Even then it helps not to expect people to change their mind right there. Especially in the case of relatives with weird ideas, it can be helpful to not go into a discussion with the explicit aim of them seeing the problems right now but to just plant a few seeds. I've seen it quite a few times that after a few days we talked about it again and they had shifted their opinion to be more in line with the presented evidence without ever really acknowledging it.