For the purposes of this exhaustive guide to all things “Mom wine,” here are the two rules of what constitutes a Mom wine: One 750mL bottle can cost no more than $15. There are no exceptions. Mom wine varieties include: Pinot Noir, Merlot, Syrah, Malbec, Cabernet Sauvignon,  Chardonnay, Riesling, Pinot Grigio, Sauvignon Blanc. While your mom did kill that bottle of Korbel sparkling wine left over from your cousin’s engagement party before leaving a voicemail…