sentence1: Jacob Slichter was the brother of geophysicist Charles Pence Slichter , the father of the physicist Louis B. Slichter and the grandfather of the musician Sumner Slichter .
sentence2: Sumner Slichter was brother of the geophysicist Louis B. Slichter , father of the physicist Charles Pence Slichter and the grandfather of the musician Jacob Slichter .