Mind if I take a crack at this problem?
"Email
Subject: Hey [son/daughter]!
'Hello dear,
I'm sorry I've been so out of touch lately. Your father, Victor, was just so focused on making sure you went to great boarding schools and apprenticeship programs that we never had much time to spend together in the last decade or so. How's it going?
Oh, and I'm not sure I mentioned, but your old mom had a bit of work done. I decided that, since your father took very good care of me financially, I was kinda tired of being a full [initial player species] and turned myself human [or whatever other species the author feels like writing]. I'm sure you understand, what with you being a hip space-traveller, that sometimes a woman wants to change things up.
I just moved into an apartment on [whever it ends up being] Station. Why don't you come by sometime? We can talk, have dinner, catch up. Oh, it would be so much fun! Also, I'm so bad with technology, I think my computer system might have gotten one of those new hypno-viruses. If you're not too busy, could you check it out? You wouldn't want to let that mean ol' computer turn your sweet mom into some kind of hussy, would you?
Love, Mom'
Your responses:
1) Oh wow, I haven't talked to my mom in forever! I ought to see her one of these days.
2) Hypno-virus, huh? I wonder...
3) What? That's not my mom's email address at all! Probably some scammer. BLOCKED!"
There. Problem solved via the magic of writing! Whatever species your mother was, she's used in-universe technology to turn herself human (or whatever the author wants her species to be. Personally, I like humans. I'm also assuming that hypno computer viruses can be a thing). If you want to just hang out and have family time, come by and (if you like) fix her computer. If you want more than that, 'fix' her computer. If you don't like the totally optional side story you can basically just ignore it and decide that that mom isn't canon for you. And instead of the author having to deal with six different species (or however many others might get added), you deal with one.