My elderly father (92 yrs old) has assigned my half-sister and her husband control over his financial affairs in regard to a sub-division he started several years ago. We are talking about $2M+ value. My sister and I are concerned that my brother-in-law may be taking advantage of our father because the figures we are given are not adding up. My brother-in-law has had some gambling issues over the years and we are afraid he may be embezzeling money from the estate. What can we do to investigate? What options do we have?