What is the legal ruling regarding the actions of this mother, who cohabits with another man while still married to her husband, claims an unregistered marriage, practices sorcery against her son, invokes curses upon him and his family, incites her children to disown him, and files a malicious lawsuit against her ex-husband while forging testimony? And what is the son's duty towards his mother after all these events?

What this woman did by taking a husband while already having one is debauchery, sin, and adultery. The punishment for a married adulterer is stoning. Her acts of witchcraft against her son and her lies are heinous matters. She must repent to Allah. Her right to dutifulness from her children is established, as long as she does not command them to commit a sin, based on the words of the Almighty: "But if they endeavor to make you associate with Me that of which you have no knowledge, do not obey them but accompany them in [this] world with appropriate kindness." The son should advise his mother and apologize to her. The rest of the children should show dutifulness to her without bearing false witness for her, and part of being dutiful to her is to prevent her from committing evil deeds.