Ok - I just looked it up from my own set of discovery documents and the final Agreement filed with the court.
The discovery documents (standard) state:
Non-Marital Property: includes gifts and inheritances given to ONE spouse, a vested pension PRE marriage and personal injury awards obtained during the duration of the marriage
Now this is all DURING a marriage. What was gifted to you pre marriage, even if joint funds were used, cannot be included in marital property.
Income can come from a job, contract work, investments and so on but "stuff" is not part of INCOME, it is part of the ASSET package. Maybe that is where you are confused?