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Only your second ex wife is entitled to a benefit off your record, because your marriage lasted over 10 years. If she remarries, then she is no longer eligible for a benefit from you.
If you remarry, your current spouse is in no way impacted by any ex wife who may be drawing a benefit off your record.
So, your current wife would get 50% of your benefit
If your ex wife has a greater benefit off her own record, she cannot draw off of yours. Also, you could draw against her benefit if she passes - but only if that benefit is greater than your own benefit. You can only draw one benefit - you can't draw your benefit plus her benefit.
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