The short answer is yes. The long answer is yes…and there is a great deal of preparation, permissions, and proceedings to be done in order for this to be legal. Essentially, enough space has to be cordoned off as a private cemetery, and thus deeded, put into a trust, and otherwise cared for perpetually. Human burial grounds are sacred, and must not be disturbed. This seems simple now, but far into the future, it must be known that the place is a grave, so as to avoid excavating or otherwise unearthing a loved-one.
There is a long and somewhat interesting procedure for doing this, and we have helped a few times over the years. It is important to treat with solemn respect and reverence the final resting places of our dead, and visit them. It is in this way we remember, celebrate, cherish.