would it be acceptable to say το "to του παιδιού σάντουιτς?"
Only in a literary and poetic context; e.g. Η του Διός δύναμις, i.e. The force of Zeus. This kind of syntax was more common in older times (note the language being somewhat archaic in my example)...
No, not really. This is classical greek syntax.
yes, that´s why i was asking. thank you.
Can someone explain what Genitive to me please. I have just started this part of the course, thank you