If you have had fraternal twins already, your chance of having another set quadruples. This is because most women who conceive fraternals (without fertility drugs) show a pattern of releasing more than one egg per cycle. Your chance of a second set numerically, is about 1 in 3000.
The odds of having one set of identicals and one set of fraternals is 1 in 10,000.
If a woman has one set of identicals, her chance of having another is 1 in 70,000 or less.
The odds of having 3 sets of twins, of any kind, is 1 in 500,000.
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