If there was a 10 year age gap between the eldest and youngest child ( 8 years between middle and youngest)
Would you assume they all 3 were the same dad or that the youngest was a new relationship?
It's no excuse but I do have Asperger and do sometimes say inappropriate things so I do apologise.
I know it really shouldn't matter but I think about what others think way too much and I know anyone could be in this situation as I could if my dh left me and I met someone else and had a 4th.