The role of family members in the helping networks of older people.
D000368:Aged / Q000523:psychology*; D002140:California; D003431:Cross-Cultural Comparison; D004641:Emigration and Immigration; D005006:Ethnicity; D005190:Family; D006801:Humans; D008019:Life Style; D008875:Middle Aged; D012494:Sampling Studies; D012931:Social Environment