Question

Compared with their __________ counterparts, __________ and __________ express a stronger sense of obligation, and find it more personally rewarding, to support their aging parents

Answer 1

I believe the answer is: Caucasian; African Americans; Hispanics

This could be seen in where the elderlies live in each culture. 
Statistically speaking, Caucasian family had the higher tendencies to put their older families in nursing home while the Asian, African American , and the Hispanic much more likely to let the elderlies to stay at their home.