I think you mean profile, not family. They call them family on their website, the keyboard enthusiast community calls it profile.
If those are the stock caps that you got with your Ducky. They're OEM. The ones at Keycap Direct is from a company called Signature Plastics. keycapsdirect.com = Signature Plastics. They dont have OEM profile. Closest will be DCS, which is their imitation of the Cherry profile.