A son follows in his father’s footsteps taking the reins of a five-decade-old family businessWhen Dick and Louise Eiseman went into the fine jewelry business in 1963, “we had a couple of cases in a department store,” recalls Louise. Now, Eiseman Jewels in Dallas is one of the most influential independent ­jewelry retailers in the United States, with a long track record of introducing new collections to market and the distinction of being luxury mall NorthPark Center’s only original tenant still standing. The couple’s son, Richard, has been at the helm of the company for more than two decades; he transitioned into the role of owner in the late 1980s, when his father’s health declined due to Parkinson’s disease (Dick passed away in 1996). Richard runs the business, but collaborates with Louise, now 85, on marketing and philanthropic endeavors. Louise says it has been gratify