That is not true. There are many ways in which we can help our deceased relatives and friends, apart from having Masses offered for them. We can offer our own assistance at Mass, and our Holy Communions; we can offer any prayers we wish, or our sufferings, and acts of Christian mortification. It is good to have Mass offered specially for them if possible. But that is not the only way in which we can help them. Nor has anyone ever maintained that a soul necessarily remains in purgatory until Masses shall have been offered.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty