Jacobs and nessie's twin daughters

Alexia and Katherine black is the daughters of Jacob black and Renesmee carlie cullen black. and what happens when nessie and the rest of the Cullen's has to move because people are sharting to notice there not ageing. when the twins was just only a month old nessie left Jacob to raise them by himself only leaving them both a necklace to remind them of her. and now what will happen when Renesmee and the Cullen's move back to forks 17 years later. And the mates of two certain volturi guards.