I know I should of avoided this headache in the first place but didn't think it would really matter, it was only small amounts of money anyways.
I don't know what the truth is here, but obviously a mod agrees with the blockchain-linkage evidence and I think you're going to have a hard time appealing their decision.
I never understood why people would share a wallet, even with family members--especially with a relative like a sibling. Where I'm from, even spouses generally keep separate bank accounts and I've never even heard of brothers sharing a banking account or otherwise mingling their finances in any way. It just seems very unlikely, especially with crypto where it's so easy to create your own wallet. That's one of the reasons I tend to disbelieve people when they say they're sharing a wallet with someone else.
What was your purpose in doing that, OP?
I suppose I am from a different upbringing. My family has always been very sharing with each other, we trust each other with everything. Spouses having separate bank accounts sounds messed up to me.
Since the amounts we are talking about were not significant ,I didn't think much of it.