Anonymous wrote:+1
since inheritance happens at death, and aunt was alive then, clearly ½ the money should go to aunt's estate ie your cousins
This. The stock should have been liquidated after grandfather's death but mistakenly wasn't. Aunt was alive at time of grandfather's death. So for purposes of deciding inheritance of the stock account, you go with who was alive at time of GRANDFATHERS death. So aunt still counts. Aunt gets half. Since aunt is NOW dead, AFTER grandfather died, then her share could either go to her husband or her children depending on aunt's will or restate laws in her state.
This is pretty clear cut and standand trust and estate query, this happens a lot. If cousins' father or if cousins themselves contest this, they will win. NOT OP's father.