Angelina
It is surprising he thinks lieing is even more serious.
Especially as it feel it won't happen often,anyway,even if the punishment would be less severe.
Sara2001
It could be harder for her,but maybe make her father less insecure,yes.And so,it could improve her situation.Not an easy choice...
Angelina
Yes,but if it is a punishable offense too to lie by omitting,it would help him to feel more secure about you,as @Sara2001 suggested.This way,he would know you would tell him what you did,even if he doesn't ask you the right question.