You say "systrar"
1 syster
2 systrar
3 systrar
Min syster slog mig (My sister hit me)
Mina systrar slog mig (My sisters hit me)
Tre systrar
One sister = syster Many sisters = systrar
And is "och" in swedish.
På svenska
"King" in Swedish is "kung".
You could say "Söta/vackra/rara systrar". Rara means more like cute/nice, so the other two fit a bit better.
Suedoise is French for Swedish.
Equality is "jämlikhet" in Swedish.
"Goal" in Swedish is "mål".
Cup is kopp in Swedish.
Spaceship is rymdskepp in Swedish.
Judge is domare in Swedish.