Yet he favored Joseph, praising him above the others and spoiling the boy with personal gifts. Resentment and bitterness can arise easily in such situations. Children must get permission before using each other's possessions. Establish a line that members of your family can't cross when teasing or quarreling. Praise and correct privately.
Sibs are no exception.
Develop a team spirit. Jacob would have been wiser to encourage his family to work together, and he should've treated each child as special. God's Word warns us not to measure ourselves against anyone. We shouldn't measure our children against each other. The Creator has made each individual unique.