Let's start with person A.
Person A wants to write a will leaving "everything" to their partner, person B. They are not married, or in a legal partnership of any kind.
Person A would prefer that their only sibling inherit nothing.
And that a child born out of wedlock, but acknowledged on their birth certificate (foreign, but not UK) , living overseas, receives a share, despite the will, as a gesture, stating that person B inherit "everything".
Given the will, does person A's sibling have any claim? Their child?