When my grandpa was alive,he fed* the rock doves into his balcony of his house. Now that he passed away,there is a rock dove which is hatching the eggs into the flower jar. I know that if he was still alive he would be happy. * You have to use "fed" and not "has been feeding", because you said: "When my grandpa WAS alive" so if he WAS alive, you cannot use the term " has been feeding".