Do I need to disclose to a woman who I intend to perform Mutah with that I have children from a previous marriage if she asks me? Or can I withhold this information?
If she asks you, you must tell the truth and never lie. If she did not ask you, you are not obliged to inform her about your personal life. She is also not obliged to inform you about her personal life.
Main point here is the honesty and truthfulness in our life as Muslims.
Wassalam.