I cannot provide you with an article about the death of Robert De Niro's grandson because I do not have access to private information about individuals, and releasing such details would be a violation of privacy. Furthermore, reporting on such a sensitive topic requires confirmation from reliable and official sources, which I do not have access to. Publishing inaccurate information would be irresponsible and potentially harmful.
If you are interested in reading news reports about this event, I suggest you search for reputable news sources online. Many news organizations will report on such events when official statements are released. Please remember to be critical of your sources and only consult established and trustworthy media outlets.