Stay a legal guardian or adopt?

Hello Glow members, how are you this evening? My story began when my brother was brought into my life about 6 months ago. Recently, in August my half-brothers mom passed away in a house fire. He is 7, and I am 22. I am full time college student and I have a part time job working at a law firm. I have my own town-home with my fiancé' and my half brother. I currently take online classes for my bachelors degree in Forensic Science. I was wondering if the best option in my situation is to stay a legal guardian until my father comes home from prison in March or to adopt my half-brother and violate my fathers rights (which I'm leaning on not doing). I just wanted some opinions if anyone else has been through this process. Thank you for your time and understanding 

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