I don't think parents, should lie to their children, as for children shouldn't lie to their parents. I personally think it is all equal. But if a parent is specifically lying to their children about problems that don't really relay on them, then maybe it's okay. But if it includes divorce, or death's I think that it is not okay for parent's to lie to their children, unless protecting them, from something.
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A subordinate clause is defined as the clause that needs the independent clause because it does not convey a complete thought. Based on the given sentence above, there is no subordinate clause, since the sentence is an example of a compound sentence having two independent clause connected by the coordinating conjunction "because". Hope this answer helps.