It’s coming to the end.
Sylvia dies and Alice goes to Chicago , where her mother grew up to find the truth. One that specific day, Sylvia leaves and she comes.
I have a feeling that The ending will be extremely emotional. I assume William will find the meaning of life even without Sylvia Because his daughter has come back. Julia may go back to New York to work but she will stay in touch with her family and the three sisters reunite.