Larger sibling age gaps?

I have a 4 year old son. Had him right before I turned 22 and I wanted to have at least 2 more all close in age. Like every two years be done by the time I'm 26 and enjoy my 30s and 40s with older kids and get to travel with hubby while still young (44). Obviously the plan never works out like we want and after almost 4 years of ttc a 2nd I've been diagnosed with something that is preventing me from conceiving.

My question is, with my son already 4 I feel like that's on the wider side of a sibling age gap. And my condition isn't improving yet with the meds so it may be a couple more years. So assuming it takes until he's 6-8 does anyone have experience with that wide of a gap between their kids? Like if we only had one more and there was an 8 year gap do you think they would be able to bond as well? I'm worried about him growing up alone and I know from experience that siblings aren't always going to be your friend through life regardless of age but I also know I'm much closer to my bio half brother I never grew up with who is 3 years younger than me than my adopted siblings I've known my whole like who are 14/15 years older....

I guess I'm looking for any positive stories? I've lived the mot so positive ones myself... Silly things I worry about when my little one is asleep....

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