I'm just a fan of marvel too, but a couple weeks ago, I started an outline of a Spiderman and White tiger movie. My concept was a little different, but I'd love to see White Tiger in the MCU. She deserves to be done right in a movie or show.

SRMember is correct. Since Justin did not win the family competition, and only was able to keep his powers due to being appointed the heaster of WizTech his kids would not have powers. As Alex Russo being the family wizard, the magical gene would be ed on to her kid(s). I believe the magic gene skipping a generation is unnecessary to use, as the fact it should have been explained as previously stated by SRMember