5 And Jethro, father-in-law of Moses, cometh, and his sons, and his wife, unto Moses, unto the wilderness where he is encamping—the mount of God;

Matthew Henry's Commentary on Exodus 18:5

Commentary on Exodus 18:1-6

(Read Exodus 18:1-6)

Jethro came to rejoice with Moses in the happiness of Israel, and to bring his wife and children to him. Moses must have his family with him, that while he ruled the church of God, he might set a good example in family government, 1 Timothy 3:5.