Difference in spending on two wives, and spending on children of one wife from a previous marriage

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Plural marriage is mustahabb for the one who can afford it; it is not obligatory
His country forbids plural marriage and he wants to marry a second wife with the permission of her brother but not her father

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She wants to marry a man but the law does not permit plural marriage. What should she do?
He has two wives and he does not allow one of them go out or to receive visits from her family except with his permission
Ruling on teaching the second wife’s children on the first wife’s day
Plural marriage is mustahabb for the one who can afford it; it is not obligatory
His country forbids plural marriage and he wants to marry a second wife with the permission of her brother but not her father

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