we should not do something that is morally wrong, if an action is morally wrong, then our parents will tell us that is action is wrong. Also, an action must be wrong if our parents say that it is wrong

we should not do something that is morally wrong

Opinion or advice.

if an action is morally wrong, then our parents will tell us that is action is wrong.

Claim.

an action must be wrong if our parents say that it is wrong

Again, a claim. This can be a premise to an argument, but one would need to support this premise. The argument made to support this premise could result in the appeal to false authority .