1. Technically he does have a right on your property but you on the other hand also have right on the property that he illegally sold.
2. Yes, you can claim your share or monetary benefits by raising a civil dispute and making your brother and the new owner a party to the suit.
3. No, it doesn't make sny difference.
Please note that before going into a litigation, it is advisable to send a strong Legal Notice to your brother, so that he comes to a settlement.
I wish you the best!