It is considered that stuttering is a multidimensional disorder that is influenced by many factors, and thus different degrees of language processing. While the belief about existing connection between stuttering and individual language variables is accepted, there is still no general agreement on their exact role for onset of stuttering and its duration. Given that research shows that stuttering often occurs when language requests are too high, the goals of this paper are to gain insight into the level of language abilities of subjects and to examine the impact of language proccessing requests on stuttering. For this purpose, two standardized tests (Peabody Picture Vocabulary Test - PPVT-II-HR and Stuttering Severity Instrument - SSI-4) were used. Also, material consisting of sentences of different syntactic complexity was constructed. The material was used to evaluate the influence of syntactic complexity and lexical retrieval to stuttering. Descriptive statistic was used for data proccessing. A sample of subjects is made up of four members of the family genetically loaded with stuttering. All of the subjects are males and their age is 23, 20, 16 and 7 years. Results are presented qualitatively and quantitatively. Three out of four subjects stutter, and range of its severity goes from very mild to severe stuttering. Two out of four subjects show below-average language abilities on measure of vocabulary range. Syntactic complexity does not, in any case, affect stuttering, while the lexical retrieval affects the stuttering of only the subject who shows below-average language abilities. It is not completely confirmed that deficits in language processing are related to stuttering, although there are some indications for that. Stuttering is present in subjects with regular language development as well as in subject with deficits in language development. However, when higher language demands are present, the subject with below-average language abilities achieves poorer performance. In conclusion, genetics and language abilities are two different risk factors that are contributers to, but arent necessarily indicative of, the onset of stuttering. This is further supported by the forth subject who do not possess a stuttering. However, more extensive research is needed to cover these risk factors in order to generalize the results.