Answer:
Overgeneralization
Step-by-step explanation:
Overgeneralization is the process in which a person make use of grammatical rule
when speaking especially in the case where it doesn't apply which was what the boy was doing by concluding that his mom drives to work because he knows that his mom always drive to work which make him to generalize it when his dad ask him. This is very common among children who are still learning how to speak accurately .
Therefore the poor grammar is an example of OVERGENERALIZATION .