I've dealt with cases like this when I

[theking]

..was in the social services field:

How Was It Possible that 'Nobody Knew' About Boy, 7, Who Died Weighing 255 lbs.? Prosecutor Points to Troubling Clues Genesee County Prosecutor David Leyton says 7-year-old Casper O’Brien and his younger sister “didn’t even exist in the eyes of the government” before the boy’s death
Seven-year-old Casper O’Brien was kept in extreme isolation by his parents, Damien and Jessica O'Brien, living in a severe hoarding and neglectful situation where he was bedridden and fed an improper diet. The children were hidden from society—never enrolled in school, lacking medical care, and completely unknown to Child Protective Services.