Young house sparrow

Young house sparrow (Passer domesticus) looking at the great tit playing (outside the frame).
I haven't found any information about whether they sit on the eggs from the first one or only after laying the last one, but seeing the differences in appearance and behavior of four younglings, I suspect from the first.
Eggs are sitted and the young ones fed by both parents after leaving the nest, although in the case of "my" sparrows I didn't notice that the male do it once.
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April 2020 @ Niepołomice, Poland
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© 2020 Marcin Świostek