I should have added typed up the rest of what Siepmann said! ::) I must admit I was just doing a take on Private Eye's,long running,look-a-like's! There certainly is a resemblance,physically! And the hair! Unfortunately,much as I profess to enjoy some of Rubinstein's music,the resemblance ends there! (Although,one must not forget his pianistic prowess!)
"Beethoven’s bastard’ he was sometimes called, due to the supposedly striking physical resemblance between Anton Rubinstein and posthumous mentor. If true, it would have betokened the longest human pregnancy on record: Rubinstein was born two years after Beethoven’s death."https://classicalmjourney.blogspot.com/2016/04/anton-rubinstein-piano-works-leslie.html