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It is definitely possible. There are tax implications for how you do the transfer. There are potential capitals gains taxes if it is a sale or there could be gift taxes. I would consult with a good accountant to figure out to minimize both of your tax liability but legally, he can transfer his interest to you.
If they were to get a judgement then yes, any personal asset is subject to a lien unfortunately.
Correct. The only caveat is that if there is litigation pending already (case filed) and a judge froze the assets by court order.
Yes he can freeze the assets but if there's no order that your brother had received then I assume there probably is not one. I think the transfer should be fine but again do you talk to a CPA or accountant about minimizing tax liability.
If you have any additional questions just let me know otherwise a positive rating would be greatly appreciated.