Parental Fog
A form of brain damage that renders a parent incapable of noticing faults in their own children that they would readily identify in the children of others.
"My son is so smart, he's going to be a doctor."
"Is he the one who glued his head to his shoulder? I think you might have a case of Parental Fog."
"Is he the one who glued his head to his shoulder? I think you might have a case of Parental Fog."