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  • Please convey my warmest regards to everyone in your family.

  • Please convey my warm regards to everyone in your family.

  • Please give my warm regards to everyone in your family.

  • I guess first 2 out of 3 sentences are correct. Am I right?
Please correct my sentences.
Comments 
The first three are fine. Convey is more formal than give. For the fourth:

I guess that the first 2 of my 3 sentences are correct.