Is it permissible to arrange a secret meeting or phone call between the sister's husband and the wife's mother, without the knowledge of the father, who forbade the husband from entering the house and meeting the wife's mother due to suspicions that touched his honor?

The wife's mother is permanently forbidden to her daughter's husband, and it is permissible for him to look at her and shake her hand. Therefore, the father should not prevent his wife from meeting his daughter's husband merely out of suspicion and ill-will. However, if there is certain doubt established in the father's mind, he may prevent his wife from meeting the aforementioned person as a preventative measure. The wife must obey her husband and not meet him except with his permission. It is not permissible for her to meet him secretly behind his back, or to be helped in doing so. The sound opinion is to comply with the father's command and try to persuade him to reconsider. The mother and the daughter's husband should exercise patience and avoid anything that arouses the father's suspicion.