Wild scenario ahead - proceed with caution.
Let's say a younger household member or close relative was arrested and charged. Everyone wanted that person bailed out while the case worked through the legal system.
Somehow, Mary decided to allow her real estate to stand for the bond, so the arresting agency put a lien on the property. Naturally, the lien was released once the case concluded.
As the case crawled through the system, said arrestee got sick of Mary "harping", nagging, etc and struck Mary. The blow, the fall, the shock -- one or all -- could have caused Mary's death.
THEN, the household has a real problem: Mary's income will stop AND the home will go to Mary's family, not the people (maybe in-laws or steps) living in the house and on her income.
Putting the body in the freezer seems a genius solution. Income and home preserved. It worked for years. When younger family member moves, Mary's address on her bank account and other official accounts is simply changed to the younger family member's.
Life flows along. Mary remains on Zion Avenue while officially Mary's money is going to another address. The story told on Zion Avenue is that Mary moved in with whoever the younger family member is. Story by younger family member is he/she just matured and naturally moved out. There's no reason family would suspect younger family member is secretly receiving funds from a dead Mary.
Then, family decides to visit the person on Zion Avenue and discovers the grim reality.