No criminal, but only civil liability, shall result from the commission of the crime of theft, swindling or malicious mischief committed or caused mutually by the following persons:
1. Spouses, ascendants and descendants, or relatives by affinity in the same line;
2. The widowed spouse with respect to the property which belonged to the deceased spouse before the same shall have passed into the possession of another; and
3. Brothers and sisters and brothers-in-law and sisters-in-law, if living together.
The exemption established by this article shall not be applicable to strangers participating in the commission of the crime.