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how do i send a copy of my tree to my cousin

Welcome to the boards, John.

It depends what you mean by "a copy".
Do you mean a physical print-out, or an online tree to which your cousin can add more if wished?


If the latter:
You can download (export) your tree as a GEDCOM file from GR and email a copy of the file to your cousin. Your cousin would then upload (import) the file to whatever genealogy site or progamme he/she uses.
But beware - if uploading to GR, it will overwrite any existing tree, so if your cousin already has a tree which he/she doesn't want to lose, he/she would have to register again (free) with GR as a new person, in order to upload your file to a second tree.

Exporting GEDCOMS:
https://www.genesreunited.co.uk/help/faqs?key=449

Importing:
https://www.genesreunited.co.uk/help/faqs?key=448


If you mean a paper copy -
unless your tree is very small, you can't satisfactorily print it out from GR, unfortunately. If it's a large tree, it would have to be printed out in small chunks on many separate pieces of paper, and then stuck together like a jigsaw..
https://www.genesreunited.co.uk/help/faqs?key=272

But if you import your GEDCOM to another programme (for instance Roots Magic - but there are lots out there) you can print it out in different ways - as a chart, or in story form, etc.