Never assume that the heirs of one person are necessarily all heirs of their spouse they had at death. It is easily possible that there were multiple marriages by either the husband or the wife. This could result in them having different heirs.
But a missing heir when the surviving spouse dies could simply mean that that heir died before the surviving spouse did and that heir left no descendants of their own.
Bottom line: compare heirs of the husband and wife if you can to find clues about potential multiple marriages.
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Love probates and wills when I can find them. Had one mystery as to which William was my ancestor. I kept finding a William with wife Gertrude before and after one Gertrude had died. In William’s will he very helpfully mentioned his first wife Gertrude (maiden ____) and their children. He then mentioned his second wife Gertrude (Maiden _________) and their children. Mystery solved from that one record. Both families were my William.