Harold Lloyd : Van Dien family

I'm just nosy. IMDB says he is the great-great uncle of Cappy & Grace Van Dien. Does anyone know how? I'm figuring because it only lists these two children, the line comes from their mother, Carrie Mitchum,and not their father Casper Van Dien, but I can't see any link on any of the Mitchum sites.

according to the research i have done on this subject, they are related to harold lloyd, on mildred davis's side. mildred davis brother jack davis married josephine, and they had a daughter who married jack mitchum carries father, who is the mother of grace and casper van dien jr. there you have it the realtion ship