The actor shared pictures of himself with Archie on his page after learning of his death.
As part of a lengthy statement, he wrote: “To my brother Archie. I still can’t quite comprehend that you have passed.
“You still had so much life to live and I’d give anything for you to keep on living it.
“My heart aches all day and everyday thinking about you and I just wish I could talk to you just one more time so you could know how much I loved you.”
Nicholas’ wife responded to the heartfelt post from her Instagram page.
She wrote: “He will love you and watch over you forever. Love you dearly,” alongside white heart emojis.
Samuel replied: “Love you mamma Lyndhurst.”