Simplify the following text for a Grade 12 native English-speaking person.
Original: He has an older sister , Natalya ( whom he has claimed at different times to be `` the number four best prostitute in Kazakhstan '' ) and a younger brother , Bilo , whom he describes as being `` a retard '' with hair all over his face and entire body , and has a very small head but very strong arms .
Simplified: He has an older sister , Natalya ( who he has claimed at different times to be either `` the number four '' or `` number two prostitute '' in Kazakhstan ) and a younger brother , Bilo , who is mentally retarded .