The bestowal of a blessing is a profound moment that demands meticulous preparation. As Joseph prepares his sons to be blessed by his father, Jacob, he organizes them with the clear intention that the blessing should reflect their birth order and rightful status. The physical act of placing hands on another person is understood as a channel to draw down a higher blessing from the ultimate source of wisdom, much like the way priests raise their hands to bless the people. Because of this spiritual dynamic, the exact physical placement of each son is of paramount importance.
Chronologically, the primary approach among commentators is that Joseph taking hold of his sons actually occurred earlier in the sequence of events [אבן עזרא, חזקוני, מחוקקי יהודה ויהל אור]. He had already brought them close to his chest, meaning this positioning took place before he moved them away from his own knees.
Approaching his father, Joseph carefully calculates their positions based on simple spatial rules. When two people stand facing each other, one person's right side is opposite the other person's left. Therefore, Joseph takes his younger son, Ephraim, in his own right hand so that the boy will stand to Jacob's left. At the same time, he takes his firstborn, Manasseh, in his left hand, positioning him directly to Jacob's right. Commentators agree that Joseph acted according to the proper and expected order [רש״י, רד״ק, ביאור יש״ר, רבנו בחיי וביאור שטיינזלץ]. His intention is for Manasseh, the firstborn, to be perfectly positioned to receive the primary blessing from Jacob's right hand, while the younger Ephraim receives the blessing from the left.
Once they are properly arranged, Joseph brings both boys close to his father [ביאור יש ר וביאור שטיינזלץ]. The specific nature of this approach highlights a deeper meaning. Rather than being brought to Jacob as a final destination—such as when a person is served a meal—the boys are simply brought toward him. This distinction reveals that the physical movement of bringing the sons close is not the ultimate goal itself. Instead, it serves strictly as a preparation and a presentation for the true purpose that will immediately follow: the actual reception of the blessing [הכתב והקבלה].