Based on the context and the answer, generate a question. 

Context: I am pretty sure I just made my brother the happiest guy on the face of the planet . He has been a Mustang car nut for as long as I can remember . Him and his friends are always going out buying new parts , helping each other put them on , and all that good fun stuff . It 's something I never understood , but oh well he loves to do it .

Answer:

They have different interests than their brother .



What may be a fact about the speaker ?