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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Nigel and Aaron look like they could be identical twins.  Zach and Nick also look like they could be identical twins.

I know that they are quads but are they all fraternal twins or is there one or two sets of identical twins among them?

What an amazing accomplishment for them all to get into the top schools like that.  I wonder if they'll all go to the same school or choose different schools based on their majors.[/quote]

Quads can happen in a number of different ways, including:

--4 separate eggs (fraternal quads, same genetic relationship as any siblings)

--3 eggs, one splits into 2, effectively creating one identical set of "twins" and two singletons

--2 eggs, each splitting into 2 (2 sets of identical twins--this would be incredibly rare I think)

--2 eggs, one splitting into 2 and then one of those splitting again (1 set of identical triplets and one singleton)

--1 egg, splits in 2, then each splits again (identical quads)

Even before fertility treatments (I have no idea if such treatments were involved in the conception of these children), [b]fraternal multiples of any kind (twin/triplet/etc) are much more common than identical twins.[/b] So, statistically speaking, it is more likely that they are all fraternal than that any of them are identical. And, the reports I've read are that they are, in fact, fraternal quads.[/quote]

Sorry, need to clarify my statement: Twins of any kind are more common than triplets. What I mean is that it is much more common for any set of multiples to arise from multiple eggs than it is for a single egg to split.[/quote]

This is not true.  I have triplets who are two identical and one fraternal - a pair and a spare. This is the most common combination without fertility treatments.  It's very unlikely that a mother will drop three eggs, also very unlikely that the egg would split three times.  More common that a mother drops two eggs and one splits.  
Almost all HOM now are fraternal due to fertility treatments. 
https://www.huggies.com.au/childbirth/multiple-births/triplets See the first paragraph stating the most common is a pair and a spare. [/quote]

Uh, yeah, what I said is that, given that only 3 of every 1000 deliveries are identical twins (that is, are from a single egg that split), it would be extremely rare for a mother to "drop" two eggs and for BOTH eggs to split, resulting in 4 babies. [/quote]

But I see I may have misunderstood you, maybe you were talking about my clarification and not my initial statement. You are right that it is unusual for ovulation to involve more than 2 eggs, in the absence of fertility treatments.[/quote]

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