Sibling rivalry goes back to nearly the beginning of time, starting with the first two brothers mentioned in Scripture, Cain and Abel. We find other sibling rivals in the Bible, including Ishmael and Isaac, Esau and Jacob, Leah and Rachel, Joseph and his brothers, and Abimelech and his brothers. In each case, the sibling rivalry led to one or both siblings taking ill-advised, sinful action.
God desires that siblings live in harmony and love with each other (Psalm 133:1). Brotherly love is used as an example of how believers should treat each other (Hebrews 13:1; 1 Peter 3:8). We know, that in the real world sibling rivalry exists. Brothers and sisters argue and fight each other, lie and trick each other, and generally treat each other horribly at times.
A parent’s job is to raise children to be Christlike, we should look to Jesus to see what He said was important about how we behave and how we treat others.
Jesus said the two most important commandments were to love God and to love our neighbor (Matthew 22:36–40). Jesus intended neighbors to mean those in proximity to us, and no one is in closer proximity than our own brothers and sisters. The home should be a place where children learn to love each other. “Hatred stirreth up strifes: but love covereth all sins.” Proverbs 10:12, including the causes of sibling rivalry.
Sibling rivalry can stem from jealousy, selfishness, and parental partiality (real or perceived). The sibling rivalry between Cain and Abel was caused by Cain’s jealousy over the acceptance of Abel’s sacrifice (Genesis 4:3–5). The murderous sibling rivalry in Gideon’s family was caused by Abimelech’s selfish desire to rule as a king (Judges 9:1–6). The sibling rivalry among Jacob’s sons was fueled by Jacob’s favoritism of Joseph (Genesis 37:3–4).
The causes of sibling rivalry can be overcome by kindness, respect, and, love (1 Corinthians 13:4–7). Parents should insist that their children treat each other with kindness, respect, and love—and the parents should model the same.
“Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice: And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ's sake hath forgiven you.” Ephesians 4:31–32
“Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves. Look not every man on his own things, but every man also on the things of others.” Philippians 2:3–4
The story of Joseph and his brothers initially involves sibling rivalry based on jealousy and hatred, and some horrible things happen to Joseph. The story of Joseph turns out to be about brotherly love, forgiveness, and God’s goodness and sovereignty (Genesis 37–50). Joseph’s treatment of his brothers in the last chapter of Genesis is a good example of kindness, humility, and love.