Was "the Kid" Don's real son?

Was "the Kid" Don's real son? - Selective Focus Photography of Child's Hand

It can be said that the movie Broken Flowers (2005) is not about the real father-son situation but even so it makes the viewer curious if the Kid at the end of the movie was Don's real son or not. Are there any sources about the movie which reveal this detail?

character broken-flowers

Pictures about "Was "the Kid" Don's real son?"

Was "the Kid" Don's real son? - Photo of Man in Raising Baby Under Blue Sky

Was "the Kid" Don's real son? - Sleeping Man and Baby in Close-up Photography

Was "the Kid" Don's real son? - Man in Gray Shirt Holding Baby in White Onesie

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Images: Juan Pablo Serrano Arenas, Dominika Roseclay, Pixabay, nappy