I'm in love with two women, want to marry both

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I am in a steady relationship and we are expecting our first child in five months. My fiancée’s parents are putting pressure on us to formalize our relationship. However, I have a son with this other lady that I really love. We have had a relationship for more than five years now. I love both ladies and want to marry them both but I don’t know what the law says about marring two women at the same time. I have to act soon especially because of the pressure from my fiancés parents who are demanding for a church wedding. Please advice on what I can do to marry both women. I don’t want to lose any – or rather, none of them will allow me to proceed with the other. {Moffat}