My father made his will through the public trustee. 8 years ago, he left me a sum of money. The rest of his estate has been left to his wife. They also have a 2 year old son whom they adopted. My sister who had not spoken to my dad in 14 years as she told him he would never see his grandchildren has now decided she wants to contest the will. She has 8 kids and does not work. I have no idea how strong this makes her case and I'm wondering if I need to get a wills and estate planning lawyer to see that my fathers last wishes are carried out? Any information would be greatly appreciated.