If the deceased left no children, no descendants of his children, no father and no siblings, one looks further up the paternal family tree to see whether a grandfather survived him.
According to Rabbi Yosi, as long as one remains within the confines of one’s own property and one does not actively damage one’s neighbor’s property, one has the right to act as one wishes.
There is nothing illegal about looking at other people just as there is nothing illegal with talking about other people.