It's not right to lie to family members.
Chad's parents ask Chad how he did on his math test, which he failed.
Chad wants to not get grounded before his friend's birthday party this weekend.
Chad is honest with his parents, knowing that he may get grounded.
Chad tells his parents that he did really well on the test.
Chad's parents may appreciate the honesty and cut him some slack.
Chad is caught in a lie and gets grounded even worse.