Make a contribution to the RAICES Texas Family Reunification and Bond Fund. This fund is being used to directly support legal services for detained separated parents and the direct funding for bonds to get parents released so that they can more quickly be reunited with their children.
Add your name to this Jewish communal declaration by Bend the Arc: Jewish Action speaking out from a place of Jewish values. Temple Micah has signed on as a co-signing congregation.
The Reform movement has taken its own strong stand which you can read here.
Finally, this is a particularly good piece that continues to be updated: How You Can Fight Family Separation at the Border.