She has a thing for buying her grandchildren shoes. She grew slightly wealthy (enough to comfortably retire...nothing extravagant) in late middle age as a result of a lot of hard work, saving, and investment. But she grew up really poor and only was able to afford one pair of shoes every two or three years as a child. She's suffered joint problems in her feet starting in her 20s as a direct result. Because of this, she has a thing for buying shoes for her grandchildren.