I have twins on the way and can answer most of your questions, with my perspective.
- Our soon-to-be twins will be [name]Cormac[/name] [name]Sebastian[/name] & [name]Cordelia[/name] Janemarie.
a) We didn’t set out for matchy names, but ended up with it (after MUCH internal debate with myself and a few posts here). We both seem to like the hard-C names, and when we found out we were expecting again we picked out a boy name and a girl name. [name]Both[/name] options ended up being matchy with our first, [name]Conor[/name]. But, that didn’t bother me, as this was going to be my last pregnancy anyway and we weren’t going to fall into a “trap” of having to use “C” names. After we found out twins, I dropped the name thoughts until we found out genders. After we found out, I drove myself CRAZY trying to decided about matchy names for 3. And spent weeks, combing through other name options. Finally, I came to the realization that no other names were going to feel right. They were already [name]Cormac[/name] and [name]Cordelia[/name] and nothing would change that in my heart. My husband was always fine with it and couldn’t understand my dilemma.
He picked the middle names, off the cuff, one night as we were going to bed. [name]Sebastian[/name] has always been a favorite of mine, so that got no argument. And, his original pick of [name]Jane[/name] was turned into Janemarie because I didn’t want to use only my mother’s name, if [name]Jane[/name] was what he really wanted. So, we added his mother’s mn too, to keep from disappointing anyone (combination style was decided after some debated posts on here too…lol).
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Boy/Girl (hope their names lead to that conclusion).
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Fraternal, of course. Mixed genders are Always fraternal.
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Timing of arrival is yet to be determined! 
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Twins do Not run in my family, in as many generations as anyone living can remember. There are no other twins in my family, out of Many, many full branches of the family tree.
Actually found out after getting into twin research that identicals Never “run” in a family. No one is sure why identicals happen and everyone has the same odds of conceiving identicals. It’s totally sporadic.
And, contrary to popular belief, twins can only “run” from the mother’s side of the family. Having twins is ALL about how many eggs are dropped in a particular cycle. Nothing about the father’s genes/sperm influences how many eggs the mother drops. So, it’s either because the mother inherited a gene (from her family) that makes it more likely that she’ll drop two eggs in a cycle, or it’s because (as in my case) she’s getting older and basically “malfunctioning”…lol. And instead of dropping the usual, one egg, two are dropped.
A lot of people will (and do) fight the logic of that, but the science is there. I guess it comes from the fact that people know couples who have twins on the Dad’s side, but not on the mother’s. That’s just coincidence. It’s either an error made by her body, or the genes still Have to be present in the mother. [name]Just[/name] because twins hadn’t happened on her side in recent memory, doesn’t mean that they’ve never happened and it doesn’t mean that she’s not carrying a gene that had been submissive for everyone else but became dominant in her, for whatever reason.
[name]Hope[/name] that made sense.
- Only one set and not planning on becoming pregnant again for various reasons.
