It occurs to me that these are the final moments when I will be able to even attempt counting the words that the kids know, and I will likely want to remember at some point what was going on when they started talking, so here is a list of words they use at the moment. Besides these words, they also have a repertoire of yelps and gasps to express surprise and shock.
ball
bath (this word leads to a frantic rush to the bathroom and desperate attempts to tear off clothes and climb into the bath)
book
uwaga (look out!)
no,no,no, no, accompanied by a wagging finger
thank you
daj! (or try)
hello
doon-doon (a word used in my family for generations to describe a cave made out of sheets or blankets)
lampa (light)
nana (all food and drink)
gloom (this clearly means milk, though I have no idea where it came from)
pić (drink)
tak (yes), maybe?
butybutybutybutybuty (shoesshoesshoesshoesshoes)
papa (byebye)
hauhau (woof woof- apparently this covers all animal noises, so koalas and cats also say hauhau)
tam (there)
mama
tata
baby
nose
rosemarymoore
migrationtothenorth 
I am so glad doon-doon is passing down the generations. That’s now five generations, and your paternal great-grandmother lives on. I wish I’d considered such a list of words for you four – I think I may have done a sort of one for Stevo, but in a quickly-faded burst of enthusiasm.
Gloom? Fertile ground for etymological mythologising!
Corrigendum! It was your father, so only three generations!