To understand the nurture vs nature debate in regard to personality one must understand what personality is. However, there are numerous definitions of what personality is; therefore, a single definition of personality does not exist. Although, personality is a pattern of relatively permanent traits and unique characteristics that are individualistic and consistent to the behavior of an individual (Feist & Feist, 2009). Numerous factors, such as the environment and heredity can influence an individual's personality and have a factor in developing an individual's personality. Gaining an understanding into how such factors affect an individual's personality enables an understand of how the development of personality occurs. I believe that both heredity and environment or environmental circumstances play factor in the development of personality. For instance, numerous tin studies show that twins raised in the same home by the same parents or caregivers can develop differing personalities (Feist & Feist, 2009)   

Reference

Feist, J., & Feist, G. J. (2009). Theories of personality (7th ed.). New York, NY: McGraw Hill.

Friedman, H. S., & Schustack, M. W. (2011). Personality. Classic Theories and Modern Research (5th ed.). Allyn & Bacon.