Mechanisms of parsing in sentence comprehension are widely discussed in psycholinguistics. Syntactically ambiguous sentences are often used to investigate this process as in these sentences grammar allows several interpretations and the listener or the reader has to choose between them. The article examines the processing of syntactically ambiguous sentences with subject and object genitive. We report the results of a psycholinguistic experiment in which native speakers were asked to read a sentence and to make choice between alternative interpretations. Our data show that these two meanings are balanced in mental grammar of a native speaker and the choice is made according to the lexical meanings of the words and extralinguistic factors which guide syntactic ambiguity resolution in this case. More detailed data on syntactic processing can be obtained using inline methods like eye-tracking.