I"m confused as to how Uzziel was Aaron"s uncle. Can you explain the genealogy?

Shalom, Thank you for your question. The genealogy is as follows – Levi, the son of Ya’kov, had three sons. One of them was Kehat. Kehat himself had four sons – Amram, Yitzhar, Chevron and Uzi’el. Amram’s son was Aaron. This makes Aaron the nephew of Uziel – and Uziel (the brother of Aaron’s farther Amram) his uncle. (See Bamidbar chapter3 verse 19). I hope this is of some help to you. Blessings.