The following websites have information about postpartum depression, written for the people who love the person who has it:
Postpartum dads: a site to help family members affected by postpartum depression
How is dad going?: an Australian site for dads
New Dad Manual: Dads, your car comes with a manual, right? Well here’s one for your new baby. Written for dads, by dads.
Postpartum Men: resources for the partners, family and friends of women who are going through postpartum depression.
Article and posts for family members and loved ones affected by PPD/A:
You can also check out the following videos:
Two dads get the scoop on PPDPPD/A in Dad Labs
How to spot PPD in your partner