I don’t think children care if they have siblings. I’m an only child and I had a very happy childhood. I never wished for a sibling and my family of origin is dysfunctional enough that as an adult, I’m definitely glad I don’t have one. 😂
That said, the thing to consider is if YOU want more than one child. One of my best childhood friends was an only child. She died at 18. I’ve always wondered what life has been like for her parents who made it all the way to raising a child to adulthood and then had no children or grandchildren in their old age.
Similarly, I am NC with my mum, but even before that, I moved to the other side of the world. Even if we weren’t estranged, she wouldn’t have a child or grandchildren around because she had just one child and I’m no longer in my home country. It sounds funny to say it, but I had two children because I wanted an heir and a spare. 😂 Two children doubles the chance that one will be here somewhere when they’re adults and having lifelong relationships with my dc is really important to me because of my own family.
I don’t know that they will care one way or the other when they are grown (they certainly don’t appreciate each other now and I’ve never known siblings who did anything but fight!), but I am grateful and happy I have them both, but that’s because I always wanted two children.
That said, you still have plenty of time to decide. There’s 5 years between mine and I wouldn’t have wanted them any closer in age.