Question: Assalamu Alaikum!
My mother was one time advising me not to spend to much time in the bathroom and was mocking me that I spend hours just rubbing my feet during wudhu.and she also said that dont close the tap again and again during wudhu and I laughed loudly at this. Would this be regarded as Kufr ? Or mocking wudhu or islam ?

Answer: 
The third person's relation to the woman is not specified. He only has to be her mahram. It could be her any mahram.
Yes it would best to have a mahram with you a male to be safe to keep track on what’s going on