You must not meet his father or brother with or without niqab as they are not your mahram. Once you marry, his father becomes mahram for you. You must refuse and reject such a request no matter what the consequences are. There is no compromise in religion.

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If they are traveling within city limits, this is permissible if he is trustworthy. Outside city limits requires a mahram for each one of them.

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It is permissible to help but you must not communicate directly with her as she is a non mahram.

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If she breastfed you five times or more when you were within two years of age or less, she is you r mother and all her children are your siblings and their daughters are your nieces and such a marriage is void and invalid as you are her mahram.

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