Is the sister of one's step mother a mahram?

Disclaimer: The answer hereby given is specifically based on the question asked and should be read together with the question asked. Muftionline.co.za bears no responsibility to any party who may or may not act on this answer. Muftionline.co.za being hereby exempted from loss or damage whatsoever caused. Should the question refer to a matter in dispute between two parties, this answer may not be used in the dispute in question by either party unless the question was jointly submitted by both parties with an acknowledgement by both parties that the question was correct and accurate. This answer may not be used as evidence in any court of Law without prior written consent from Muftionline.co.za.