She said

One day Allah's Messenger ﷺ visited me looking pleased and asked if I was not surprised to hear that Mujazziz al-Mudlijl1 had entered, and seeing Usama and Zaid2 with a rug over them covering their heads and letting their feet appear, said, “These feet are related.” (Bukhari and Muslim.) 1. Members of the tribe of Mudlij were said to have a reputation for being able to trace relationship from physical features. 2. Usama was Zaid's son.