For I cannot return to my father without the boy, lest I appear as a witness to the calamity that will oppress my father.
Other versions
King James Version
For how shall I go up to my father, and the lad be not with me? lest peradventure I see the evil that shall come on my father. English Standard Version
For how can I go back to my father if the boy is not with me? I fear to see the evil that would find my father."New International Version
How can I go back to my father if the boy is not with me? No! Do not let me see the misery that would come upon my father."