Genesis 45:22 (NKJV)
“He gave to all of them, to each man, changes of garments; but to Benjamin he gave three hundred pieces of silver and five changes of garments.”
Depending on how you do it, preferential treatment is not necessarily wrong, because affections and commitments cannot all be the same to everyone. For example, the way you treat your wife cannot be the same as the way you treat your sister. There must be a difference. Although your sister is special to you, it would be wrong to treat her the same way as you do your wife; in fact, people cannot expect that you treat both parties the same way.
Joseph loved all his brothers, and he gave all of them new clothes, but his gifts to Benjamin were understandably significantly more. And I don’t think the other brothers would have complained.
Whenever you express preferential treatment, therefore, may the reasons be legitimately just and explainable; and may it be done in such a way that others do not feel oppressed or neglected.
“Father, may my bias not cause a stumbling to anyone. Whenever I need to show preferential treatment to someone, Lord I pray that I can do it in an understandable manner and never in a way to spite anyone or make anyone look bad. I pray for the wisdom to do this, in Jesus’ name. Amen.”