ANSWER:

If you told them the evidence in Bukhari and Muslim and still they don’t believe it, you have done your duty and must move on. 

I know there was a sahih Hadith of Hudhaifa saying the prophet urinate standing When I said this my parents got angry saying im lying on the prophet and they are rejecting this Hadith because of heavy influence by Somali Sufi sheikhs but they are not Sufi. Any advice on how to deal with them ?