Late in 2014, Kim, a widow, executed a valid will leaving her estate to her children, Rob, Arya, and Sansa per stirpes. In early 2017 Kim, Rob and Arya quarreled and Kim decided to draft a new will. Kim, recently diagnosed with cancer, went online and found a preprinted will form, and filled it in with her own handwriting: "Because my son Rob and daughter Arya have been unkind to me, I specifically disinherit them. I give and bequeath all my property to Big Charity." Kim signed and dated the form. No one was present when she signed and dated the form.

In 2015, Sansa had adopted a son named Jon. In early 2018, Sansa died, survived only by Jon. In January 2019, Kim died, leaving an estate worth $800,000. Kim's 2016 will has been offered for probate.

1. What arguments can Rob and Arya reasonably make in objecting to the validity of Kim's 2017 will?

2. Does David have any claim to a share of Kim's estate?