Hi @bstar,
Thanks for joining us here to talk about the concerns you have for your brother. I'd like to preface this post by saying that we can't provide any medical answers or advice here as that would contradict the community guidelines, but it does sounds as if some expert medical advice could be helpful in some of the situations you've described. And as tempting as consulting 'Dr Google' can be, it doesn't deal with the specifics of your family and how your brother feels.
What was clear from your post was the level of concern you have for your brother. Particularly, you are concerned about the health of your brother, given that he is often up late and frequently spends his afternoons and evenings indoors. You also mentioned that he plays touch (football?) and has recently begun working. Do you think your brother finds his gaming habits get in the way of his life and relationships, or vice versa?
You also mentioned that your brother is often arguing with your mum about going to play sport. Sometimes conflict can arise for a number of reasons but could your brother have other reasons for not wanting to participate? Did he used to enjoy playing sport but doesn't any longer?
It sounds like these concerns are causing a lot of frustration, and you are also concerned your mother doesn't have quite the same level of concern to help your brother. Although I do think some level of professional assistance would help, you may also find this article about effective communication with teens to be useful.
Please keep us updated with how your brother is doing, and let us know if those resources have been helpful.
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