I definitely knew Julian...maybe I just forgot about the other wife or was surprised how much Julian didn’t look like Yoko.
I’ve always heard that for decades after John’s death, Yoko and her son Sean found ways to legally block Julian from receiving any portion of John’s estate or finances. This only recently changed in the last ten years.
On April 8th, Julian will be 51 years old, and most likely will never become a father, by his own choice.