To marry old and new, analyze your starting point. Note the colors, materials, textures, and shapes of your family heirlooms, and look for new purchases that touch on one or more of those themes. Match antiques with delicate, intricate seating like this Jamie Young Greek Key Settee or Ming Round Back Chair. Blend mid-century modern with the Arteriors Home Normandy Credenza or channel Frank Lloyd Wright minimalism with the Four Hands Callaway Chair. Augment wooden pieces with contemporary updates, like the golden Made Goods Driftwood Milo Mirror or geometric Chevron-patterned Jada Stool. The best interiors are a mix—these timeless pieces will complement any of your cherished heirlooms.