My parents are both alive and have several investments, property, stock, and their retirement 401k account. It total it's not too much. How do they go about securing their assets where if one spouse passes the other doesn't make bad decisions due to pressures from one of the children?
Is there someone in the family who is pressuring them now for loans, money, etc.? You may want to take a look at their finances and check bank accounts, etc. for irregularities. You can also place a fraud alert on their credit report that will prevent someone for taking out a loan or credit card in their name.
It is really difficult to keep someone safe from greedy family members if they are "enabling" them.
good luck