Kaddish is recited near the grave but at least 4 amot (7 feet) away from the nearest grave:  

• If the son of the dead person is present and the burial occurred on a day when tachanun is normally said, the version of kaddish recited is the same as for a siyum (celebration of completing studying part of mishnayot or other holy books).
• If there is no son of the dead person present or if it is not a day when tachanun is said, then the version of kaddish recited is the normal mourner's kaddish.