is our distant step brother entitled to a share

[adrian 792]

sum up briefly, my farther left a will leaving equal shares to his children including a step brother { result of an affair over 45 years ago}, whom we has had very little interaction with, recently he change this by reducing his share to £20,000 by handwritten acknowledgement and his signature as a discretionary payment, my father has passed away from Covid 19 my sister and myself cared for our father for the last 6 years of his life, we have little to do with our other brother and step brother as my father acknowledges they were a waste of space, now they have surfaced and are demanding their equal share as they have obtained his old will showing no changes, while i reluctantly accept my estranged brothers right to his share i object to the step brother as he has rarely bothered with our father until now

[Sam101]

I believe that only if the change to the Will was correctly done with a Codicil that was signed and witnessed can it be considered the last Will. If not, then the original Will would stand. However others on the forum may not agree with my understanding?