a cloud darkened over the duenas family. when casey graduated from high school in june -- >> i remember walking to where we would be sitting and just seeing, my dad and mom along with other family members. but there was one spot missing. >> five months went by that we. as if those early police this patients had faded away. but of course, we know better. don't we? >> coming up. mark duenas is in for a bitter shock. >> he was upset. like, are you kidding me? >> and what his family did next would surprise everyone. >> so this is never happened. >> yeah, like never! >> when dateline continues. ore skin. so roll up those sleeves. and help heal your skin from within with dupixent. dupixent is the first treatment of its kind that continuously treats moderate-to-severe eczema, or atopic dermatitis, even between flare ups. dupixent is a biologic, and not a cream or steroid. many people taking dupixent saw clear or almost clear skin, and, had significantly less itch. don't use if you're allergic to dupixent. serious allergic reactions can occur,