Is it necessary to inform the girl you intend to propose to about your mother's intention to live with you in the marital apartment on a half-time basis, or is it permissible to conceal that, or merely allude to it, to avoid her rejection?

A man is not obligated to inform his fiancée of his intention to have his mother live with him, but it is preferable to be frank and clear to avoid conflict. A wife has the right to an independent dwelling, and she cannot be forced to live with any of her husband's relatives except with her consent.