What are my chances of developing schizophrenia if it runs in my family?

Fairly low unless...: Here's a site that gives a nice summary of available information: http://www.Schizophrenia.Com/szgencounsel.Htm the general population risk is 1%. If both your parents have schizophrenia, that jumps to 35-46%. Risk with a sibling is 7-14%. Naturally, if multiple close blood relatives all have schizoprhenia, the odds rise; distant relatives have a much smaller effect on risk.

Good questions: Your odds of developing schizophrenia are 10% if one parent has it and 50% if both parents have it. The odds are lower for more distant relatives.