Go for a picnic to Nehru Park or Lodhi Garden followed by a nice dinner at Khan Market.
Check out Chanakya Mall. It has MKT which is lovely.
Barbeque nation or jungle jumbore
Jw mirage at mangalam palace
I would suggest visit the place where your family spent quality time like Pratapgarh Farms. This is family place.
Lots of amazing options at Dlf cyberhub