Muhaqqaq Masala

When a girl departs (after marriage) and goes to her in-laws' house, then being subordinate to her husband, the in-laws' house itself becomes her homeland; however, her maternal home (Maika), which is her pre-existing original homeland (Watan-e-Asli), will remain her original homeland as long as, according to custom, her visits and stay there are relatively more than at her in-laws' house. And when she starts residing permanently at her in-laws' house, and visits her maternal home temporarily, then her maternal home will no longer remain her original homeland, and in case of staying for less than fifteen days at her maternal home, she will perform Qasr (shorten the prayers). (Bahishti Zewar: 2/50, Fatawa Mahmudiyyah: 7/501) (Derived from: Kitab-un-Nawazil: 5/452)