بسم الله الرحمن الرحيم
(Fatwa: 1408/1408/M=11/1434)
If you have not said the said conditional words regarding any specific night rather you said it unconditionally then whenever the wife will stay at her mother’s home in the night then as per the condition one talaq shall take place whether she stays there with your permission or without it. The ruling shall be similar in both the cases. Now you cannot terminate this condition by changing your intention. Talaq shall definitely take place when the condition is met. However, you will have the right to take your wife back within iddah period.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband