i don't think so
yes it was named after the fort lee tower in Ohio
Inuyasha does not have any twin siblings. However, he does have an older full-fledged demon brother named Sesshomaru. He's related through their father, InuTashio. They had different mothers, Sesshomaru's being InuKimi and Inuyasha's mother being Izayoi.
No because Inuyasha: The Final Act is the last series of Inuyasha and that didn't have Inuyasha's baby.
The second season of inuyasha is called Inuyasha: The final acts.
Episode 18 of InuYasha the final Act