Aaron Kahlow takes the success of Web site services firm BusinessOnLine very personally. He is not only the firm’s co-founder and managing partner, but also one of three siblings involved in the business. His dad, Ron, conceived the original concept for the Little Italy-based company.

“I enjoy seeing all of my family prosper — financially, personally and professionally,” says Kahlow, 34, a graduate of Virginia’s James Madison University. “I never would have imagined growing up that we would someday all be working together.”

His brother, 31-year-old Thad, is BusinessOnLine’s other managing partner and his sister, 29-year-old Amanda, is the senior Web site consultant. Their father has since retired, but is “working on a couple side projects to save the world,” says Kahlow.

With a staff of about 30, BusinessOnLine offers services such as search engine marketing and Web site design and development to customers including Chevron, Tyco, Cisco Systems, Kimberly-Clark and HSBC.

Kahlow is credited with shifting in 2001 the focus of BusinessOnLine’s business model from back-end hosting to Internet marketing, a change that has proven more profitable. He negotiated the company’s first client under the new model, a $20,000 search engine-marketing contract with Silicon Valley-based manufacturer Ross Cook.

“My goals are closely tied to the success of the business,” he says.

Still, he enjoys the ability to be his own boss. “For me personally, it’s about being able to make choices, versus doing things you have to do.”

The Kahlow family and BusinessOnLine have volunteered time and donated money to the annual AIDS Walk at Balboa Park, the San Diego Habitat for Humanity, the American Red Cross following the 2004 tsunami in Indonesia, and a family of four affected by Hurricane Katrina.