I think family has issue with pragati class and if she get pregnant it is impossible to separate praghbir as for bm I think she tried to distract pragati from investigation . Even if pragati was at her father home it is quite possible she reveal the bani secret to his father and tried to dig out the truth with help of him so she call back pragati so can keep an eye on her. Even when pragati lost key she than went to office with rm for the first time after marriage and did not get the time to check the rm room.
I think aditi married to devraj due to some crisis and rm distant himself from her . When he showed pragati his dream house he clearly told that only he and bani live there and noone. Rm is always a lonely person I think even before meeting bani . Remember he told his brother that numbers never lie that why he done well with them. He has definitely some big issues with his parents even before meeting with bani.