My grandfather passed away a few weeks ago. He was 90 years old, diagnosed with dementia, and created a Will (I will refer to as his original Will) about 20 years ago that went unchanged until the last 3 years. The "original" Will had 5 beneficiaries getting an equal share of my grandfather's entire estate. 3 years ago, my uncle was taken completely out of my grandfather's original Will due to a big falling out between the two. 3 or 4 months ago this summer), his Will was then changed 2 or 3 DIFFERENT times (that I know of) within a month, completely removing my brother and my cousin, then adding back my cousin and Uncle. My uncle now is the executor of his Will and stands to inherit almost everything. Do I have a valid reason to contest, and if so, when should I do it?