So before me and my gf started dateing I "adopted" her younger brother who is older than me but is in my grade and his like my only bff cuz my other two moved away around the same time but anyway...so he is my son but then I started dateing his sister and uhh- if me and her were to get "married" what would that make my son to her,,,

like uhh- what would that make him to her and what dose that make him to her now even... Ah! my brain🤡

*gets ignored*