
Fraternal twins, also known as dizygotic twins, develop from two separate eggs fertilized by two separate sperm, resulting in twins who are genetically no more alike than any other siblings
SEPARATE sperms. So, he was pregnant..then got pregnant again.. ヽ(`Д´)ノ

No. That's superfetation. When a pregnant woman gets pregnant again while first pregnancy is ongoing.
Fraternal twins are just twins. In which 2 different eggs are fertilized by two different sperms but at the same time, during the same cycle by the sperms during the same ejaculation. . So two different amniotic sacs are formed. And that's how they're different from identical twins.
What you're saying is superfetation.
Is that his REAL dad?
no, not anyless weird, but they aren’t blood tied, uke married the semes biological father so hes a stepdad
Thank you sm