If You Only Knew by Kristan Higgins (2015)

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Marvelous romance novel, which could be classified as a regular novel.

The novel is about two sisters: Rachel and Jenny. Jenny is divorced, still good friends with her ex and moving to upstate New York to open her bridal design store. Rachel is married to Adam and has three adorable toddler triplet girls. However, the course of divorce and marriage never runs smooth. 

The beauty in this novel is in the rich characters and relationships, from the one-upping in unhappiness that their widowed mother delights in, the secret about their father only Jenny knows, and Jenny's new handsome super. 

Rich and realistic and touching and hard and sweet all at once.