I'm guessing that your babe will take center stage again as soon as s/he arrives. Unfortunately, though, people seem to be obsessed with identical twins so you may just have to get used to the fact that your child may play second fiddle for a while. It suck, I know, but we are all here to listen to you vent any time.
When I was pregnant with my first, we were going to wait untill the end of my first trimester to tell any of our parents. One weekend my mom, stepdad and my stepsister and her dh were all over at our house. All the sudden when dh and I were out of the room there was lots of whispering and smiling, that seemed to end everytime we came into the room. All very hush, hush stuff. Finally, my mom gave in and told me that my stepsister had just found out she was pregnant (a big oops!) and they didn't want to tell us because they knew we were trying to get pregnant and didn't want to upset us. It was sort of a bummer because they didn't even want a child at that point -- heck, they were planning their wedding -- but she can't seem to take her birth control on a regular basis. It sort of ruined our announcement, but we went ahead and told them that night that they didn't need to feel bad for us because we too were going to have a baby. Not exactly the way we had hoped to make our announcement, and I felt a bit like the excitement of our announcement had been diminished.
Our due dates were exactly one week apart and it got really old being compared to each other. My mom and stepdad didn't start dating until my dh and I were engaged so I didn't grow up with he or my stepsister, though we did grow up in the same town. We are very different people and aren't close. We also raise our children very differently which has been an issue because she is very mainstream (formula, daycare, spanking, etc) and to my mom and stepdad, we are doing it wrong, and they are doing it right. I have thick skin, though. Funny that they talk about how well behaved my boys are, and how whiny and annoying my stepsisters kids are. Guess I must be doing something right.
Anyway, the point of my whole thing here is that once you have kids you live with stolen thunder and lots of comparisons about your parenting if you have relatives with kids close to your kids ages. It isn't fair, but it is life.