Panels depict the distribution of (a) social stress (negative social interactions; questions adapted from Neal Krause, higher scores indicate more social stress), (b) quality of the relationship with the care recipient (sum of three items assessing closeness, communication, and overall relationship with the care recipient; higher scores indicate better relationship quality), and (c) family functioning (General Functioning subscale of the McMaster Family Assessment Device; higher scores indicate better family functioning) among informal caregivers of lung and colorectal cancer survivors.