Are gifts from parent to adult child part of marital property?

Yes and No. Yes, if the money is commingled with other marital money - i.e. deposited into a joint checking/savings account. No, if the money was deposited into an individual account of only the specific spousal recipient and no additional marital funds are ever added to that account. However, should portions of the received money ever be used to pay for a portion of or a total expense (i.e. kitchen remodel, down-payment on a car, etc) then that item or remodel cost could be deemed to have become marital property.