This is such a common cause of estate litigation, because such jointly owned property may be taken from the joint owner and put into the estate under certain circumstances. You most probably will need a lawyer if only to explain to you those circumstances. Then you can judge for yourself with the lawyer's advice whether or not the CDs belong to you. Most likely the siblings will continue to demand those CDs and if refused, may file a complaint against you to recover them. If it goes to court, you should have a lawyer represent you.
Citing
Citing is done to give the originator credit for the information used.
If you're citing for a high school or undergraduate paper, just follow your teacher's directions. If you're citing for a law school paper or as an attorney, never cite to Vernon's. It is a secondary source of law that is meant to help readers understand the law. It is only persuasive, not binding. So, cite to the actual RSMo.
Citing
Citing Statistics enables readers to locate a table or data used in research projects. Citing Statistics should have the Date of publication, Creator of data, Place of publication.
Properly citing references (in footnotes, endnotes, and/or a bibliography) includes the copyright information.
"Writing without citing" is worst than overcitation, or even under-citation. But too much citation would undermine your own research, and perhaps, it is a bigger sin to mis-cite; say, you are citing about someone who didn't say what you have penned down. Or, similarly, miscitation or wrongful citation about a phrase which you have written, you have by mistake wrongly cited someone (the author who never said or meant anything like that) what you have written, and then wrongfully cited him or her. Which means, you just passed down your own thoughts as others claiming deceitful evidence or credits. It is also better to search for similarities of your own ideas coinciding with others who have penned down any such before you, even if that is your own though. Not citing such means, you are the first one to think and get the idea which exist but you never would have been cared. This is blatant overlook and hence-unintentional plagiarism. This is opposite intentional lazy work- of not citing the original source as because you have not properly search for the references. Hence, perhaps, overcitation is better than misscitation or not at all.
There are many places where one can find information on citing websites. The following websites have information of citing: "SEMO", "Bery Livey Library", "Bellevue College", as well as "wikiHow".
No legal limit when citing author. Not citing is immediately plagiarism.
blubber
You, or your attorney, could send her a "cease and desist" letter, citing the contract. However, the damage is probably already done. At this point, you could attempt to sue, but I am unsure as to how far you would get with that, or even if it would be worth it. See what your attorney thinks. He will have better advice for your specific situation.
Citing