This "Peanuts" character got a sister named Sally in 1959
[DOC] [TLE] 10 Peanuts Characters You've Probably Forgotten | Mental Floss [PAR] Jun 12, 2011 ... One of the most bizarre characters in the Peanuts universe was 555 95472, or 
... 5's sisters 3 and 4 made a few appearances in the strip before .... Jean's letters, 
Sally turned them away, saying no one by that name lived at the address.