If you want you could get one pair for Dad and one one for you, so you can match

Size Guide

Sock Size                      Standard Australian Shoe Size

Extra Small (XS)             9 - 12 Kids Size

Small (S)                       12 Kids - 2 Adult Size

Medium (M)                   2 - 8 Adult Size

Large (L)                       8 - 12 Adult Size

X-Large (XL)                  12 - 14 Adult Size