There used to be an addon for this. But the creator put it in to legacy mode. I think this feature would decrease the workload and would make it harder to answer card where you only know the answer because you recognize the question not that you understood what the question asked
A feature would be more useful than an addon because it would be ported to Ankidroid sometime.
How do you define mature? Maybe the option to set the number of days siblings are buried for would be enough?