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.
Apple is äpple in Swedish.
"Goal" in Swedish is "mål".
Suedoise is French for Swedish.
Equality is "jämlikhet" in Swedish.
School is skola in Swedish.
Adventures is äventyr in Swedish.