If the account is not held jointly by you and your spouse, don't check the 'joint' box, since you are filing as single.
Report only your portion of the 'account balance'.
If you're reporting interest earned on the foreign bank account held jointly with your sister, report only your portion of the interest income.
You may not need to file Form 8938 for Foreign Financial Accounts unless this applies to you:
Unmarried individual (or married filing separately): Total value of assets was more than $50,000 on the last day of the tax year, or more than $75,000 at any time during the year.
Here's more info on How to Enter Form 8938 and details from the IRS on Foreign Financial Accounts.
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