I wonder how hard Google could press an estate. For a living person the main consequences would be criminal, not civil, but you can't go after a dead person criminally. Civilly it's not really clear to me that Google would have been harmed enough to create noteworthy damages.
The book publishers might actually be the bigger problem. They'd have civil copyright infringement claims with giant statutory damages.
And even fewer who are single and childless. (Google would likely go after the estate of anyone who did this.)