Question
What is the name of your state? texas
after 22 years of death of father, funds located at unclaimed property, is the insurance company or state liable to pay interest
for any part of the 22 year period of having possesion of the money
Answer
No they are not. Stop being greedy. It's not the state's fault that the insurance company couldn't locate the person. You were lucky that the insurance company reported the amount to the fund, because many companies don't. The insurance company probably should have made more of an effort to contact him before turning the money over--they probably didn't try very hard.