Two unperfect parents

Elizabeth Olsen is a 35 year old woman, actress and a Hollywood gem at the peak of her career. She's married for 5 years to Robbie Arnett, 31, musician, front man of the band Milo Greene. The pair lives Los Angeles and recently they had started a partnership in writing kids books to fight anxiety named Hattie Harmony Worry Detective. Elizabeth had always wanted kids but she's not really into pregnancy, adoption may be a solution but still, she has doubts, She and robbie have frenetic and busy lives, they travel a lot, also she is so much in the spotlight and Robbie doesn't feel himself as a father.
However, Elizabeth had thought to open their house for fostering but Robbie didn't feel much okay having kids in the house needing attention that he never practiced with, especially the one with severe trauma so Elizabeth had found another way: open the house for international students. they are for sure up to 14 years and more, independent and less with trauma and this could be a practice to juggle teenage years. Robbie had let himself coax wanting to try for his wife but he was still doubting.
They had been looking for an Agency to candidate as Host Parents and choose the perfect guest, what will happen?