In regards to the valar feelings, in some early variants of the story (and even in HoME X - "Fionwe son of Manwe"), we find refferences to the sons of the valar (though Chris discarded those versions in the Silmarillion).
Concerning Melkor's relation to Varda, it is noted in Myths Transformed that he desired to posses all light:
Quote:
As a shadow Melkor did not then conceive himself. For in his beginning he loved and desired light, and the form that he took was exceedingly bright; and he said in his heart: 'On such brightness as I am the Children shall hardly endure to look; therefore to know of aught else or beyond or even to strain their small minds to conceive of it would not be for their good.' But the lesser brightness that stands before the greater becomes a darkness. And Melkor was jealous, therefore, of all other brightnesses, and wished to take all light unto himself
|
and esspecially Varda's, since she was the keeper of Eru's light, the only one untainted by Melkor.