Southwest Airlines Community

I’m planning to travel next month on a same day trip to pick up my 10 month old grandbaby and bring him  home with me. I would like for his mom to be able to meet my incoming flight at the gate and sit with us until I board the flight home with him.  How can I get her through security for this?   Also, do I need to book my flight legs as separate one way trips on the app since I will have a lap child only on the return flight? ... View more