Carlos Aguilar A backyard swimming pool tells part of the story in Colombian American writer-director Alessandra Lacorazza Samudio’s “In the Summers.” As it goes from refreshing site of joyful congregation to an ignored eyesore in mounting disrepair, the recreational amenity establishes itself as a potently grave motif for the passage of time in this unsentimental, and yet immensely affecting debut feature about a complicated parent-children relationship. Told in four elliptical segments, it spans roughly two decades.