He mistreated his wife so as make her register the car in his name
Question

                Wife had some money from her scholarship which was with her brother. After marriage, she asked him to invest in his buisness and give her the share.Investment was not succesful, so he returned the money later and both husband and wife bought a car with that money. Later they left the country and husband's brother used the car and paid almost only half the price.

The confusion is that :--

Is it unIslamic for the wife to not give that money in husband's hand at the first place? Was it obligatory for her to assign that car to husband's name instead of her own?

Is it Islamic for her husband to misbehave and not fulfil the basic needs of her because of that action.

Is it not husband's duty to be responsible for all basic needs of kids and wife? Is it flexible for him? Is it only sadaqa from his side, if he spends?
Praise be to Allah.
    She does not have to give the money to her husband. Her money 
    is hers, unless she willingly gives up something to her husband or her 
    brother or to someone else. She does not have to register her car in her 
    husband’s name unless she has given it to him willingly. On this basis it is 
    not permissible for her husband to mistreat her in order to make her give up 
    some of her wealth. He is obliged to spend on her from his wealth, not from 
    her wealth, and to find her safe and suitable housing, just like any other 
    husband. The same applies to his children. If he spends on them seeking 
    thereby reward from Allaah, he will get that, if Allaah wills, even though 
    that is regarded as his duty.