Who is the only surviving Andrew sister The Andrew sister singing group?

Who is the only surviving Andrew sister The Andrew sister singing group?
Patty is the only surviving sisterLaverne died in 1967 (cancer) and Maxene in 1995 (heart attack)They are both interred at Forest Lawns, Glendale, California - where apparently there is room left in the crypt for Patty when she dies - is she so wishes