The kids pattern says to hold the two yarns together.
Two skiens of Claudia's findering is 350yds. (175x2= 350yds)
One skein of Madil's kid seta is 230 yds.
Use the smaller number (230yds) as the starting point for how much yardage you need.
For the adult pattern....
Three skeins of GGH Aspen is 192yds (3x64=192yds)
So, you'll need about 192yds.