>

My eldest sibling is 20 years older than the last.  In the middle, I am 8 years older than the last and 12 years younger than the eldest. I happen to be the bridge between both “generations” (or more accurately age groups). Neither feels understood by the other but I perfectly understand each of them and their respective ways of reasoning to a large extent…
Who in their late teens is in the process of starting or having their own family? >

Teens who don’t think condoms are important >

Lol, I could be wrong, but I think you both misread the post. If not and you're just having fun, then please carry on. >

Nah I got OP I’m just making a joke with what the og commenter said. >

Username checks out >

As long as the older sibling isn’t expected to play parent, I don’t think it’s that big of a deal. Also I doubt most of those pregnancies are intentional >

One of the two isn’t intentional.  Could be having a kid in their late teens vs mid 30s >

Completely ridiculous.  Take your upvote. >

Yea fucking hell this is stupid. He/she has my upvote for sure. >

I mean OPs not wrong, I've known such cases and indeed they didn't have a normal sibling relationship. >

I mean... Is every child entitled to an appropriately aged sibling? 
What about only children?
My sister and I did nothing but fight until I was a preteen, then very shortly there after I found sex and drugs and ruined whatever brief close friendship/sister bond we had, and we were 3 years apart.
Not every child has a sibling. Not every set of siblings has a good sibling bond.
As long as the parents lovingly parent, provide for, nurture, and supervise (and all the other millions of things good parents do) each kid, they aren't being selfish. >

Sister and I are 6.5 years apart. We still don't get along in our 30s. I don't think "appropriately aged" is ever a guarantee, despite what my sister seems to think.
In the Nature vs Nurture- it's Nurture here. It's on the parents to foster healthy relationships between children, no matter how close or far apart they are (and then on the individual as they grow and guide their own actions).