Ken Osborne with his mother. Ken Osborne became vigilant about safeguarding his 81-year-old mother’s savings as her memory loss set in. She often failed to recall what she’d said during frequent, unsolicited phone calls from people prying into her personal life and financial affairs. “She’s vulnerable,” Osborne, a resident of Jacksonville, Florida, says about his mother who lives 140 miles away. Osborne took preventive action. He signed his mother up for a debit card funded by, but segregated from, her primary bank account. Osborne maintains a $500 balance in the card account, giving his mother the freedom to spend her own money – whether for groceries or a church excursion to North Carolina – while giving him control of t…