Laelius's two sons-in-law were both consuls - Gaius Fannius who was consul in 122 BC along with Gaius Sempronius Gracchus, and Quintus Mucius Scaevola Augur, who was consul in 117 BC. The younger son-in-law, himself connected by marriage to the Brothers Gracchi, was a prominent rhetorician and jurist, and the teacher and mentor of young Cicero. Cicero thus learned much about Laelius and his relationships with great men from his mentor Scaevola Augur. Some of those relationships were inspiration and source material for Cicero's treatises on friendship.