It can be, yes
As a general rule, the younger the age of onset (<45yo is early onset), & the more affected relatives (especially close ones), then the more likely it is genetic & the higher the risk to blood relatives.
Average age of pd onset is 58. The older you are @ disease onset, the less likely it is genetically inheritable. Look @ this link for help on genetics: http://www.Ncbi.Nlm.Nih.Gov/books/nbk1223/.