i dont think any conflict will happen. they will keep sacrificing preeta for eachother.
Dear, the bond between the bothers has been so sweet and chummy since beginning, that eventually for sure makers will decide to show a rift between them sooner or later to test their relationship and for drama. It's bound to happen eventually with how close they have been shown and how both have been shown so closely linked to preeta. Not like arora sisters who have never really been shown so closely linked with one guy like luthra brothers with preeta have. They will defo show the brother's relationship being affected somehow negatively, and it will have something to do with preeta only. Since beginning it's the brother's bond that had been shown as foundation of kundali bhagya's story.