Resin, The reason why I thought it was mom and youngster was because I see it constantly chasing dad around begging for food which he does feed her
Possible, but I'd think it's a bit early in the year yet for House Finches to be fledged - finches are generally fairly late nesters. I'd say more likely the female testing out the male, to see if he can be relied on to act in the right way when given a dose of begging
Royal Tern (?)
Yep!
Resin
