Every parent, guardian, or other person having control or charge of any child required to attend public school, private school, or church school, shall as soon as practical explain the cause of any absence of the child under his control or charge which was without permission of the teacher, and a failure to furnish such explanation shall be admissible as evidence of such child being a truant with the consent and connivance of the person in control or charge of said child, unless such person can show to the reasonable satisfaction of the court that he had no knowledge of such absence and that he has been diligent in his efforts to secure the attendance of such child.