Mr and Ms House Finch and Mr and Ms House Sparrow all on the same tree.
House Finch (Carpodacus mexicanus):
House Sparrow (Passer domesticus):
(He looks interesting. I'd sure like to get more/better photos of him.)
I think this is a female house sparrow also (better detail):
Must be nesting. That's a overexposed feather in her beak.
Here's another one of the male house sparrow. He looks so cute. Nesting.