Format-> Conditional Formatting is your friend
The easiest thing to do is to select the first box (B2 if I'm reading your
cheat sheet right) and do the following
Format-> Conditional Formatting
Choose Cell Value Is from the first drop down
Choose Equal To from the second drop down
Type "=B$1" in
This could be done by a VBA function but I'm curious how this will be
checked. You have the data, is it being continuously changed? Do we need to
check it continually? Do we need to compare all values of familyX and
familyY or just two specific rows at a time? Are familyX and familyY
constantly be
