realSugar is watercore
We're on the same wifi and yes I did use my email address for her account because to my knowledge she does not have her own email (also I used my email to sign her up for Discord),but she posts on it and I don't. There's no real way to prove it I guess, other than taking Sugar's word for it on Discord, but I understand that people sometimes get upset with the whole "oh it's actually my sibling" thing so whatever.
Furthermore, all of the Blockland players in my house have our keys bought with the same email address (my father's email), which adds to the appearance that we're all the same person. We aren't though, but I don't know how I'd prove that besides Discord. I'm uncomfortable with sharing too many photos of my sis cause she is just a little kid.