Writing

with DNA relatives. I know yours is not a DNA question, but a contact of relative questions.

1. You have a right to reach out to relatives. They of course have a right to accept or reject contact.
Sometimes a good relationship develops, sometimes not.

2. You should decide what you want to do about the letters. Do you want to share them with your cousin's offspring?

3. If you complete a family tree for your cousin, you should be able to track down living relatives.
And you can call, FB, or email them. Keep first contact short, people get overwhelmed with too much information in first contact.

Hope this helps, let me know if I can help more.