Is it permissible when visiting the grave of a deceased family member to "speak" to them as if they are there. To tell them how much they miss them, they love them. In general to express feelings, emotions, stories, etc.
Not to speak to them in a way that one would expect and answer. Or to speak in a way as if to request that they do something for them.
I have in mind that perhaps non-Jews are accustomed to doing such things, that's why I'm asking if there is anything in halacha that would prohibit such a thing.