I realize this is late - so, maybe it doesn't help (sorry!). I have two. Let me back up:
I grew up an only child and for a while really wanted a sibling. I was close to cousins; so, that helped. That said, pretty early on, I realized it would be very bad (due to family dynamics) if I had a sibling and I was grateful I did not. I had a lot of thoughts about kids/families growing up and into adulthood.
Got married to someone who was an older sister. Person I married wanted 2 (and maybe more - I don't recall). My kids are amazing and for the most part, 2 is great. Here are some of my other reflections and caveats:
I love my children so incredibly much and I would not want to change things in any direction because they would not be alive/with me.
That said, I had children with the wrong person.
By the time child 2 was possible, I think we both realized this would not be a good thing (generally) but we were both putting in the effort (sort of) to maintain a happy family. It was sort of one of those, "having a child will save this marriage" things though that never came into my head or was said.
2 seems like a great/ideal number generally. That said, as a single parent now - there are so many times having another set of hands would be invaluable.
She just quit her tech job of 7 years. The company went public a few years ago and I know she is flush with cash and stock options, but an uncertain future drives me up a wall. She shocked us when she majored in computer science, so now she wants to figure out the rest of her life, or at least the next step.