It often comes on so gradually it’s hard to pinpoint when it turned a corner. Hiding and rummaging can even be exaggerations of traits the person has exhibited all his or her life. Someone who has taken care of business — gotten the mail, paid the bills, made sure everything is taken care of — has crossed over into behavior that is detrimental to their and potentially their caregiver’s welfare. One friend, whose husband had vascular dementia, and who had his entire adult life taken care of the family business, began to hide the mail. Bills, notices, financial statements, it didn’t matter. It went into a hoarding place (in addition sometimes to the trash) that only he knew. It took his wife and children several weeks to work out where all these important pieces of paper had gone, and then to sort out how to prevent it happening. 
The article, (link below), has practical suggestions that, if not immediately applicable to your specific circumstance, may well offer ideas for adapting with the least amount of struggle.
Caregiver.com
Published by Nancy Taylor Robson
I grew up sailing and building boats with my dad, married a tugboat captain, (who I'm still happily married to) and embarked on a life of adventure, challenge and fun. My first book, Woman in the Wheelhouse, told the sometimes harrowing story of working on an old coastal tugboat as cook/deckhand then worked in Mexico in the Campeche oil fields on a supply boat. I was one of the first women in the country to earn a tug operator's license. I'm the author of three other books, Course of the Waterman, which won the Fred Bonnie Prize for the novel, the historical novel, A Love Like No Other: Abigail and John Adams, A Modern Love Story, and OK Now What? A Caregiver's Guide to What Matters, which I wrote with longtime RN and hospice nurse, Sue Collins during the time my mother-in-law was moving to the end of her life.
My second, Course of the Waterman, the coming of age novel of a young Eastern Shore waterman, won the Fred Bonnie award in 2004. My third book, second novel, A Love Like No Other: Abigail and John Adams, A Modern Love Story, takes readers into the lives of the new nation's strong-willed second First Lady and her stubborn, often-absent and adored husband, John, our second US President. I wrote the book because I'd spent big chunks of time raising children alone while my husband was at sea and felt an affinity for Abigail, but also looked to her life as a MUCH bigger challenge that informed and encouraged my own. My fourth book, OK Now What? A Caregiver's Guide to What Matters (Head to Wind Publishing, 2014) was written in collaboration with Sue Collins, RN and longtime hospice nurse and has received heartwarming feedback on how helpful it's been to many caregivers.
A freelance writer for many years, I've published personal essays, features, maritime reporting and analysis, travel, garden and more for such places as The Washington Post, Yachting, House Beautiful, The Baltimore Sun, the Christian Science Monitor, Southern Living, Sailing, and more. I'm also a University of Maryland Master Gardener who grows and cans the family's fruits and vegetables, and a Bay-Wise program certifier. I write, sail, race sailboats (occasionally), walk the German Shepherd dogs, and cook for friends and family.
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Nancy Taylor Robson 