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 .
According to the above context, answer the following question.
What may be the cause for their brother 's happiness ?


They bought their brother parts for his Mustang .