She was very correct in saying they should be the one to inform them before someone else tells. She didn't want to pressurize Dev to tell his family. But she shared what she feel was right.
And finally Dev said they will find time and tell the family.
But i guess Ishwari mom will get to know before Dev tells her. According to the spoilers. Dev's mom now only has doubt on Dev Sona's bond. But Soon she'll realise they are actually in love. Lets see how the track unfolds further. Looking forward to the upcoming episodes.