Mother's day spending

Men are more likely to spend money on Mother's day than women (in both percentage and amount). This is a fact but this is also a nice example of "confounding" for intro stats. I heard about this in the news (people were joking about this as a "mom's boy" phenomenon) but can't find that exact news article today. I found the data on Mother's day 2005 (a pretty neat collection of numbers). Here is the interesting part.

Celebrating Mother's day (i.e., buy gifts ... )

All 83%
Men 85%
Women 81.1%

Who do you plan to buy a Mother's Day gift for this
year? (Check all that apply)
(in the order of all, men, women)
Mother or Stepmother
65.2% 64.9% 65.3%
Wife
19.4% 39.8% ---
Daughter
8.4% 4.9% 11.6%
Grandmother
7.4% 6.6% 8.0%
Sister
5.3% 3.9% 6.6%
Friend
5.7% 4.0% 7.2%
Godmother
1.1% 0.8% 1.3%
Other relative
10.7% 5.5% 15.4%