Another Year Together chronicles three romantic relationships in the same New York City family during the Holidays. Jonathan and Sophie, 30s, have been together for several years and are on the fence about marriage. Jonathan's sister, Julie, 40's, is newly single, and is starting anew with her brother's best friend, David. Jonathan's parents, Barbara and Eddie, 70's, have been married for almost 50 years, and find themselves on the precipice of divorce. Between Thanksgiving and New Year's Eve, each couple goes through relationship Hell as they confront the reality of what it means to be in love.
Just after he turns 16, Robert finds out that he is adopted, and his parents find to their horror that he was kidnapped from his real parents. They decide to tell him about this, although they fear that they might lose him. Robert runs away to find his real parents. He finds and gets close to them without revealing his true identity. Eventually, he must decide where he belongs.
When Grace comes to live with her daughter and son-in-law, she is eager to find a way to be useful in the community. She loves to read stories to children, and decides to read one on public access television. The response is so strong that a large company hears about it and offers her a television series. Her life becomes complicated as she is forced to make some serious decisions. Through it all, Grace is able to help a young mother realize that time is the most valuable gift she could give to her daughter.