Sarah Ann Knier knows what she likes. She confidently invests in furnishings that are destined to endure. When she relocated from New York City to Richmond, Virginia, in 2011 with her husband, Whit, and their son, a curated collection was already in place. The years that followed welcomed additions of varying kinds: two more children, several decorative acquisitions, and a move to a different house in the same neighborhood, where the foundation of their interiors remained strong.