How would I use свой here
Свой is used to refer to the subject, so it usually cannot appear in the subject, since then the subject would refer to itself.
Note that the subject here is женщина и её сын, not just женщина.
Женщина и ее сын готовят свой завтрак = The woman and her son are cooking their breakfast.
"Женщина с сыном готовят завтрак" No?
I think spelling mistakes should be explained separately
still don't understand why готовят завтрак isn't in Accusative.... can anybody explain?
It is in the accusative. It's just that the nominative and accusative declensions of this word are identical.
Yes, I just had closed my mind and forgot about the inanimate consonant ending. Thank you