The Fosters 4×16 “The Long Haul” Season 4 Episode 16 Sneak Peek – Stef’s mom Sharon and her boyfriend Will announce their engagement, on all-new episode of “The Fosters,” airing Tuesday, March 14th on Freeform. In “The Long Haul,” Sharon and Will (guest stars Annie Potts, “Chicago Med,” and Rob Morrow, “Billions”) return to the Adams Foster home with news that they are engaged. While the family happily prepares for the wedding ceremony, Stef learns that her mom is having second thoughts about getting married. In an effort to come clean with Jesus, Emma writes him a letter but learns he is hiding a secret of his own. Meanwhile, Jude is teased at school when Lena organizes an LGBTQ-friendly sex ed class for students.