My husbands british am tanzanian my husband has a wife in london with kids ,we are married legaly in my country my sons surposed to have his fathers nationality or not and how do I go along with it

Your husband is a bigamist, actually. Tanzania still goes under British legal system. I would not pursue this any further if I were you. It doesn't matter if you are legally married or not, he is married in UK, but to answer your question, yes, they can get a passport, they are British citizens.

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