Question: Were siblings of particular interest to Josef Mengele?, Answer:Yes, Description of Sibling: one of two or more individuals having one or both parents in common, Fact1: Josef Mengele was a member of the German SS and was a physician during WWII., Fact2: Mengele did extensive research with identical twins, as they had near identical DNA.
Step1: Which activities was Josef Mengele known for during his lifetime?, Step2: Did any of #1 involve siblings?, Wikipedia page for step 1: Josef Mengele, Wikipedia page for step 2: , not_definitive_answer: False, incorrect_answer: False