In using Dear Sir, Dear Madam, or Dear Ms., Sir or Madam or Ms. stands in place of the person's real last name. So, yes, both are capitalized. However, this is just for business letters.
Exemptions:
"Dear sir," I said, "do not correct my grammar!"
"Dear sir, let me get the door for you."
"Parents" is typically not capitalized in the greeting of a letter. It is only capitalized if it is used as part of a proper noun, such as "Dear Parents Association."
Yes, "Dear Team" should be capitalized when used as a greeting to address a group of individuals collectively.
Yes, "Pterodactyl" is supposed to be capitalized as it is a proper noun referring to a specific genus of pterosaur.
Yes, the first word of a greeting is typically capitalized, such as "Hello," or "Hi," to show proper punctuation and etiquette.
"Godspeed" is typically capitalized when used as a standalone expression or as a formal greeting. In other contexts, such as within a sentence, it may not require capitalization.
"Parents" is typically not capitalized in the greeting of a letter. It is only capitalized if it is used as part of a proper noun, such as "Dear Parents Association."
Earth, as in we live on the planet Earth, is supposed to be capitalized. Earth, as in the dirt we walk on, is not supposed to be capitalized.
Yes, "Dear Team" should be capitalized when used as a greeting to address a group of individuals collectively.
Usually, yes a phase of the moon is supposed to be capitalized.
No, it shouldn't be capitalized.
No it shouldn't be capitalized.
Yes, America should be capitalized.
no
Yes, "Pterodactyl" is supposed to be capitalized as it is a proper noun referring to a specific genus of pterosaur.
Yes, the first word of a greeting is typically capitalized, such as "Hello," or "Hi," to show proper punctuation and etiquette.
No, but the names of individual languages are capitalized.
Yes, Siamese would be capitalized.