Here's the low-down on my series and spin-off titles:
The "Black Diamond" and "Coin" series each consist of two books that should be read in a definite order. Here are the specifics:
Series Name
Read this First
Read this Second
Black Diamond
Legacy of the Diamond
The Black Diamond
Coin
The Gold Coin
The Silver Coin
In addition, I have other books that involve some of the same characters / families. Usually, a secondary character (family member) in the first book(s) becomes a main character in the next book. It's not essential to read these books in sequence. But if you want my recommendation, here it is:
Family
Read this First
Read this Next
The Barretts
My Heart's Desire
Samantha
The Kingsleys
Echoes in the Mist
Wishes in the Wind
The Thorntons & The Bromleighs
The Last Duke
Yuletide Treasure (my story in A Gift of Love holiday anthology)
[either one can be read first, followed by the other]