Down syndrome results when cells receive three copies of chromosome 21.

Yes they do receive copies of the same information that each taxpayer receives for the tax year.

A centriole splits so that both cells will receive copies of the same chromosome

They do not automatically receive anything. In some cases, the executor will not have to provide information to the family. They can obtain copies of anything filed with the court.

You will receive one copy of your license to be signed by the officiating person. That is returned and they will issue a Certificate of Marriage. You can obtain additoinal copies for a small fee.