For readability, I would like to be able to band a spreadsheet that has been
grouped. Either of the following solutions would work...

Ex:

Ford
Mustang
F-150
General Motors
Corvette
Silverado
Honda
S2000
Ridgeline
Element

1. (Preferred) Alternate grey (G) and white (W) background on rows at level
1 and have all child rows inherit that background color.

(G) Ford
(G) Mustang
(G) F-150
(W)General Motors
(W) Corvette
(W) Silverado
(G)Honda
(G) S2000
(G) Ridgeline
(G) Element

2. (Acceptable) Set a grey background for all rows at level 1 and a white
background for all child rows.

(G) Ford
(W) Mustang
(W) F-150
(G)General Motors
(W) Corvette
(W) Silverado
(G)Honda
(W) S2000
(W) Ridgeline
(W) Element

Obviously, this involves Conditional Formatting, but how can I ask a row if
it's group level or how can I band child rows to follow their parent row when
the parent rows alternate background color?

Thanks!