The complaining includes the members of Moses’ family, and it is Moses they are complaining about. God makes it clear that he was the One who appointed Moses as leader, and his choice is to be respected.
Spiritual leaders today are supposed to be people of character. In 1 Timothy 3 and in Titus 1, we are given qualifications for those who are to lead churches. Since these are people who are to be followed, it is a huge responsibility, and these qualifications should be carefully considered. According to Hebrews 13:17, these leaders should be obeyed so they can consider leading the church a joy. Unfortunately, Moses and many leaders today experience the opposite.