A law student or lawyer Who can answer me this question, with relevant article of civil code. Mr. Arega, diagnosed with dementia, made a holographic will leaving his estate to his caregiver. The will was signed by two witnesses, one of whom is the caregiver’s relative. After Mr. Arega’s death, his children challenged the will’s validity. Discuss the validity and the fate  of the will made by Mr. Arega based on the legal provisions of the validity of wills and testamentary capacity.