Deficient paternity cases, where the DNA profile of the defendant is not available, are not unusual in forensic practice. Considerably larger sets of genetic markers have to be examined than in standard casework and the statistical evaluation of the DNA evidence is more difficult. Such a case can also be burdened with danger of false inclusion. We used Identifiler system to profile the subjects of the fatherless case and there was no exclusion when we typed the child and his grandparents only. Mother's typing, however, revealed exclusions, but only in 3 STR loci among the Identifiler system.