The below refers to family caregivers/unpaid caregivers as informal caregivers:

Urbanisation and search for better economic opportunities have driven migration. Das and colleagues (2012) discuss the impact of rapid urbanisation on people with dementia in Kerala. The authors argue that urbanisation has caused earning members of families to migrate for better economic opportunities. The authors suggest that, as a result, there are fewer family members to provide care, which leaves many people with dementia with little care options.

References:

Das, S., Ghosal, M., & Pal, S. (2012). Dementia: Indian scenario. Neurology India, 60(6), 618. https://doi.org/10.4103/0028-3886.105197