What United siblings with twins in it?
be nice to them as much as you can, do nice things for them.
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.
Are twins supposed to get along better with each other than other siblings who aren't?
well its said that twins get along better.... but theres always an exception..;)
What are the chances of having twins if your grand mother had twin siblings?
Better then those that have no genetic leanings in that direction.
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.