In the US, if you are *legally* married for 10 years and then divorce, you can apply for Social Security benefits on your former spouse's benefits if you are unmarried at the time of applying for Social Security.
The wives of a man who had 3 monogamous marriages for 10 years each could all apply for social security benefits as former spouses on the man's benefits.
Therefore, hypothetically, a man who has 3 sister-wives could legally marry each one for 10 years, then divorce and then when they reach the required age could add 3 social security benefits to the family household.
*Not legal advice.*
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The wives of a man who had 3 monogamous marriages for 10 years each could all apply for social security benefits as former spouses on the man's benefits.
Therefore, hypothetically, a man who has 3 sister-wives could legally marry each one for 10 years, then divorce and then when they reach the required age could add 3 social security benefits to the family household.
*Not legal advice.*
Understanding Social Security Benefits After Divorce
You might qualify for benefits through your ex-spouse’s earnings.