Yes, he cursed Shawn, but since Shawn was his father, he basically cursed himself. After all, they are related.

"Do you really want me to call you that? Are you trying to satisfy your vanity and sense of security, or do you truly acknowledge me as your son?" Joshua asked.

"What do you mean if I truly acknowledge you as my son? Joshua, you are my son; my blood flows in you, and you share my genes. Your personality is even similar to mine."

"I feel that calling you Shawn is more comfortable for