Kairav and Saumya Engineer have witnessed their father's struggle in making Astral Pipes what it is today. Since they joined the company in 2011 and 2016, respectively, they have significantly grown the piping and adhesive business of Astral. Now the goal is to make the brand synonymous to one-stop-shop for all building materials. What are the principles that guide their vision and how does it feel to become a part of Forbes India Tycoons of Tomorrow? Brothers reveal