If you believe a loved one's will is not valid, you may be able to contest it. But proving a will is invalid is difficult and this process should be undertaken only if you are sure there is something wrong.
When you die, your debts do not expire with you. Most debt still needs to be paid off, if possible, although who is responsible for paying the debt depends on the type of debt, and some assets are protected.
While it isn't possible to entirely prevent the possibility of power of attorney abuse, there are steps you can take in drafting a power of attorney to greatly reduce the chances.
Legendary singer Aretha Franklin was thought to have died without a will, but the recent discovery of handwritten documents is calling that into question.