Ok, here's the thing.
I'm having a really hard time believing that it was your ''brother and sister'' that joined on the alt accounts while you were away from your phone... because I took a look in the server logs at their time spent on the server, and some of the things they do and say make it seem an
awful lot like they weren't brand new to the server...
.NotMayankBot is the first alt to join the server after your ban. In under 3 minutes they've finished reading all the rules, made it through the tutorial, and the first thing they do is head straight to /warp iron, with no one else in the chat having mentioned or advertised it to them.
How did they know about it? Maybe they guessed/hoped it would work, ok.
After /warp iron they immediately go to /warp freeiron, which is advertised at /warp iron, so I'll give them that.
Once they've grabbed themselves a set of iron gear and tools, they start asking for nightvision potions. When no one offers up any, they ask a player to go and fetch some for them at a specific warp that no one has mentioned in chat.
How did they know about reaps potion warp? When no one had mentioned it in chat in the 7 minutes since they first joined the server?
After this, they head straight to mining, find diamonds near instantly, and after mining for 6 or 7 minutes, they head to /warp shop to sell exactly 2 of their diamonds and then straight to /warp deluxe to buy a diamond pick for the exact money they just made, with no one having mentioned that warp in the chat since they joined 15 minutes earlier.
How did they know about
that warp too?
They leave about 5 minutes later.
About 8.5 hours later, the second alt .NotGamingBot joins the server for the first time.
.NotMayankBot also joins 6 seconds later, which is odd since you said your brother and sister were using your phone for the alts, and 2 accounts can't log in at the same time.
The first thing they say, a minute and a half after joining, is asking Dorito about being promoted
How did they know Dorito recently became staff?
Within 10 minutes of joining the server for the first time, they are making recommendations to warps that no one else has mentioned in chat previously..
I suppose the second alt learned this from the first alt, right? Which we still don't know how they knew about it, since no one had advertised it to them either...
16 minutes later we see .NotGamingBot gifting over a stack of deepslate diamond ore to .NotMayankBot,
I wonder how they knew about the /gift command when no one has mentioned it in the 26 minutes since they joined the server for the first time ever... Nor during the 20 minutes that the first alt was online previously...
I happened to join the server a minute later, upon which .NotMayankBot was immediately concerned if i am staff, and .NotGamingBot quickly gifts them the last of their deepslate diamond ores and leaves.
Which wasn't suspicious at all... so I looked into their mining logs and determined x-ray activity, promptly banning both accounts.
A few days later, a 3rd alt, .YESANUJGAMING, joins the server for the first time, from the same IP as the other two.
Of course 'AnujGaming' being in the name immediately raised a red flag, but they played it cool at first..
But soon they jumped right into the same routine, getting a pick and night vision potions so they could begin x-raying again...
After no one ended up giving them one, they went straight to /warp freeiron again, with no one in chat telling them about it... then went straight to /warp iron, which is not advertised at the previous warp, nor was it mentioned in chat by anyone... then straight to res.
They were soon caught and banned for x-ray by another staff member.
Do you still want to stick to your story that all the alts were your ''brother and sister'' on your phone while you were away?
Can you explain to me how they had such knowledge of the server to make their way so quickly and easily upon joining for the first time?
How were the first 2 alts on at the same time if only your phone was used while you were away?
So many questions... your story just doesn't add up.