We are also in a similar situation, my father (a U.S. citizen) had a Will drawn up and signed by two family friends as witnesses here in Canada. It was not written by a lawyer, but is just basic and leaves his estate to his two children. He was diagnosed with Alzheimer's prior to the Will. We felt he was lucid while he signed it though, same with a Power of Attorney. Does any of this make it any easier/harder to contest? We believe his wife (in the U.S., he remarried 10 years ago) will not agree with it.