Answer: Rico Brogna
Although he was a former first round pick, uncle Rico Brogna didn't put together a stellar big league career. However, he was solid enough to stick around for nine seasons with various teams, including a decent three year run with the Phillies from 1997-1999.
The first baseman spent much of his career in the NL East, which ended with his 2001 stint in Atlanta. Brogna finished his career with 106 home runs, a 94 wRC+, and a 1.9 fWAR.