Related to Property and bigamy

Hello Online Helpers, Here are two parties A - Husband B- Wife (Legally married in court) A and B had intercaste marriage and had a only son. Both left their hometown and worked for several years. Since they were not accepted by family being intercaste marriage. But after 20 to 25 years of living abroa6d they planned to come to family in india. So A and B planned to build a house with all the amount they had earned all those years. So b sent a to hometown to build a house. later when a returned he said instead of house he has started a primary school. b was satisfied at that moment. after few years of running that school she cane to know that A has affair with another unmarried lady half of his age. She talked to her husband but the husband kept dening the fact that he was in any relationship. The very next year wife founds that they were living together as a husband wife out from that place. so my question is what are possible ways by laws that first wife can get justice in this sitution present sitution first wife is still legally married not divorced school is run by a trust with his husband name as one of the society members husband's is running school as a director post