What is the ruling on a divorce occurring if the husband made it contingent on a specific non-mahram person entering his house, and this person entered by force?

Scholars have differed on the occurrence of divorce if Zayd enters the house under duress. The Baghdadis held two opinions regarding the consideration of Zayd's intention to enter, while the Basrans unanimously held that intention is not to be considered. The apparent meaning of Al-Shafi’i’s words leans towards the opinion of the Basrans. The one who decides such matters is the Sharia judge.

As for the entry of non-mahram relatives into the home and the failure of some family members to observe the hijab, you must advise them. You must prevent your wife from appearing before non-mahrams without a hijab and prevent her from being alone with them. She must obey you in this. If it necessitates preventing her from visiting her parents, she must obey, but you cannot prevent her from maintaining ties with them to the extent that no corruption occurs.