Mental disorder. Filipino by the way!

Very good question. Your question raises several points which need to be answered for the benefit of others too. What you have asked is the common dilemma of every parent or caregiver who is looking after a schizophrenic patient. As a parent you want your child to be well and function properly. You have seen your child since childhood and have observed many behaviors which no one else has. This way your observations matter and are valuable. You have observed your child when he was not diagnosed and 2hen he was diagnosed. So your question is also arising due to this experience of urs that though your child is a schizophrenic, how can you recognize healthy and unhealthy behaviors in him. You have observed certain behaviors which you think may not be due to schizophrenia. And since you feel such 'normal' behaviors are there then he may not be schizophrenic. In your question I can see that label of your child as someone having schizophrenia is playing a role in creating confusions. This label of shchizophrenia is a devastating one as anyone who recognizes schuzophrenia or has some idea about this disorder would feel hopeless of any improvement. This disease is no doubt a serious one which is sometimes incurable. The label of schizophrenia comes with many misconceptions. In fact, before that a label of  adisorder in itself comes with a stereotype. We may feel that since our family member has a psychiatric disorder so there is no scope of any normal behavior. We generalize the label of a disorder to overall psychological state and whole set of behaviors of a person. But this conception comes with a limitation and more knowledge is needed on part of caregiver. The label means that the person is having a set or cluster of behaviors that are characteristic of a disorder. But this label doesnt inform what OTHER behaviors the person is capable of performing. That same schizophrenic can sometimes be seen as even  incapable of grooming and sometimes may be seen as doing a regular job. That person may at one time be observed to taking care of daily activities and at another time may even not able to sleep or eat well. So it is difficult to say on the basis of few 'healthy' behaviors that whether a person is schizophrenic or not. If your son has been diagnosed as having schizophrenia then he may be showing typical characteristics or symptoms of this disorder like hallucinations, delusions, disorganized sleech or behavior and negative symptoms like anhedonia or asocality. So yes it is possible that the person doing few daily or easy tasks that you mentioned may be having schizophrenia. But showing these behaviors doesnt mean he doesnt have schizophrenia anymore. Schizophrenia doesnt go away easily by few months medications. So I or any other doctor would recommend that you take him to a psychiatrist and get his medications start asap.

Visit a psychiatrist

Leaving medicines on oen us not helpful in long run. Self-diagnosis should be prevented.