Money trouble that comes from a family member, a stranger, or a helpful acquaintance usually shows up first as a line on a statement that nobody can explain. The earlier you read that line, the easier it is to fix. You do not need to decide who made it before you check the facts.
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The lines worth reading first
Go through the last three months of statements, not just the most recent one. Look for a payee you do not recognize, a subscription that started without anyone mentioning it, cash withdrawals that break the usual pattern, a card or account added in a name you do not know, and transfers to a person rather than a company. Look also at what is missing, such as a bill that used to be paid and now is not.
Signs that call for a closer look this week
A caller or visitor who asks for secrecy, pressure to act quickly, papers to sign that the family has not seen, mail about new credit or loans in your parent's name, and a sudden change in who has access to the account are all worth a call. None of these proves anything by itself. Together they are a reason to slow down and check.
What to do in the first week
Lay the statements and bills side by side. Call the bank or card company using the number printed on the statement or the card, not a number a caller gave you. Ask for the full account history, ask which alerts can be set, and ask how to add a second contact for notices. The Consumer Financial Protection Bureau publishes plain guidance on protecting older adults' money and on what to do when something looks wrong, and the Sources page lists where that guidance comes from.
When to bring in the state
If the pattern suggests someone is taking money from your parent, report it. Missouri's Adult Protective Services, run through the Department of Health and Senior Services, takes reports about suspected exploitation of older adults. You do not need proof before you make a report.
Count the checking as work
Reviewing statements is unpaid labor, and it lands on whoever has the login. Give it a set time each week, write it on the family list, and share the review with a sibling so one person is not the only one who knows what the account looks like.