Zeng Father bought every brand of milk powder available on the market for his grandchildren: Russian Old milk powder, Wandashan milk powder (3-5 yuan per tin), Feihe milk powder (3-5 yuan per tin), Nestlé milk powder (8-10 yuan per tin), and Red Star milk powder (around 10 yuan per tin). He mailed them all and wrote that he would send two tins every month.
