Moses’ father-in-law Jethro, along with Moses’ wife and sons, came to him in the desert, where he was encamped at the mountain of God.
Jewish Publication Society of America Version (JPS1917) - Exodus 18:5 >And Jethro, Moses' father-in-law, came with his sons and his wife unto Moses into the wilderness where he was encamped, at the mount of God;