The problem for those who assert biblical authority in support of traditional definitions of marriage is that one could with equal validity assert that the lending of money or certain kinds of haircuts are forbidden by God or that slavery and the subjugation of women are authorized by the Lord.
I'm not convinced about marriage. Divorce is so easy and that fact that gay people are not allowed to marry takes much of the meaning out of it. Committing yourself to one person is sacred.
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My mother had a son from previous marriage and her husband died in Second World War.