I will leave the training to hrdgain, cause if you get to many people telling you to many things it get confusing.
But you said your not eating much, just drinking water and tea. Well if you want to lose some weight and gain some muscle , you must eat. I know it can be tough getting in the 5-6 meals a day. But you should try and if you have to you might want to start buying your own groceries. You may even help change some habits in the family.
You can train as much and as hard, but you will not see the full benifits if your diet isn't in check.