Are identical twins more common than fraternal twins?

Answer No, about 1 in every 3 twins is an identical twin.Source:

Top Q&A For: Are identical twins more common than fraternal ...

Which is more common fraternal twins or identical twins?

If identical twins had babies with identical twins, would the children be biologically siblings?

Biologically they'd be full siblings, if their twin parents married singlets their cousins would be biologically half siblings.

If a girl slept with two identical twins and got pregnant, would both twins...?

I Think the Careful Analysis of the DNA (Germline), Would Reveal Some Difference. E. g., the Incorporation, of Viral DNA.

Is it possible for fraternal twins to have different fathers?

Yes. There is a less tha one percent chance that a mother will have fraternal twins by two different fathers.