Fae MisFortunes

It's their first case.
Sid & Sin are tasked to find the missing kids.
Then they hear that this has happened before. 
To one of their family. 140 years ago.
Kids with a fae bloodline are being taken, and one may be Sin's future son.
How is a guy supposed to plan his future with the perfect woman when her son is missing? 
The twins are racing the clock to keep the past from imploding the present in this tale of old hatreds, jealousy, power, love, and the strength of family.