Is the child resulting from the fertilization of the second wife's ovum by the husband and its implantation in the first wife's womb permissible or forbidden, and who is his legitimate mother?

This type of artificial insemination is forbidden in Islamic law, falling under five categories prohibited by the Islamic Fiqh Academy, due to the resulting confusion of lineages. Since the pregnancy has occurred and the fetus is in its fifth month, the questioner must repent and seek forgiveness. As for the legal mother of the fetus, she is the owner of the egg, not the one who carries, gives birth to, and breastfeeds. Therefore, his second wife is the legal mother of the fetus by lineage.