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Its not only allowed ....its recommended to share with others , especially neighbours.
 
The only potential problem is they may want to reciprocate. Let them know up front you can only eat halal food and explain that all vegetables would be halal.
 
^I think he means the brother should tell them that any vegetable they give him would be all right for him to eat.

But also, veggies might be a problem, if they're cooked using something haram, such as lard, or alcohol.