I over herd my mom and my dads cousin talk on the phone and both talked about wanting to set up my cousin and my second cousin is that odd ?

sounds really odd to me too and you can tell your parents i said so

A little but it happens. My 2nd cousin is married to his 2nd cousin once removed from another part of his family.

Depends on the state u live in. I would google it see what gives.

Yes
That is weird.

Yes, heard is not spell herd. Heard is when you hear something and a herd is a group of animals.
Most folks don't want to date relatives; and I doubt that anyone in your family plans on setting related people up.

nope it's normal