Answer:
(Fatwa: 1018/1018/M=1432)
The father of husband (father-in-law) is mahram for wife. Your wife is not correct. It is necessary for a woman to observe purdah with non-mahram he is a relative or not, and it is necessary to avoid talking without any need. Probably, your wife is not aware of the status of husband. It is not lawful to disobey parents but she should preferably obey her husband after marriage.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
