From the sibling point of view I've never really had one. My twin died shortly after birth and I became an only child.
Not going to get into details, but will let imaginations do the work for me... New on-shift nurse, didn't know who was who. The family with same name walked into the hospital and the lady explained this is # 8 and it's coming now. Sue was in x-ray trying to figure out why she wasn't delivering after 27 hours... Nurse walks up to me asks if I'm Mr. xxxx. I said yes. Time to prevent an early breach birth... Wrong Wife! Of course my grandmother and the right husband show up at the same time, grandma wants to know why I'm doing what I'm doing, right husband says I'm doing fine. Nurse and Grandma insisted we switch. Very uncomfortable.... Let's just say I was scrubbing that hand for days. They had a girl, we had a boy, insurance denied the circumcision because "we" had a girl. It took months to sort it out. An experience I never ever want to go through again.
Have you seen the kitchen I designed and built in VA?
That's sad about your twin Bob.
The hospital mix-up with your son...that's crazy! It does remind me of an old Bette Midler & Lily Tomlin movie though. Two sets of parents that both delivered twin girls at the same place and time. Each parent got a Midler/Tomlin set of girls. The girls don't figure it out until they are adults. Fun movie if you ever feel like looking it up some time.