I had a lot of trouble picturing Lalli with kids of his own, it just didn't... seem right, you know? And then, with a little introspection I discovered that, in my headcanon, Lalli just doesn't have kids. Lalli can't handle kids (at least not in this phase of his life). Stop.
Then, I couldn't help imagining him visiting his nephews... a total derp!
"Tuuriiii!!!! What am I supposed to do with him??!??!"
"Ugh, just hand him to Onni!"
Onni, in the other hand, is a wonderful uncle and adores his nephews ^^ Lalli loves them too, but doesn't know what to do hehe
Oh, and Starfallz, those are some seriously great watercolors