This HaBO is from Sharon, who is hoping to find this series:
I recently read a book (part of a series) in which the twin brother of the hero (or two brothers of the heroine) finds out that they are not fraternal twins, but half brothers. One was born within a few days of the other to the father’s mistress.
At end of book, the brothers move to another town. Their books were to be subsequent ones to that series. I think it ties to another series set in that second town.
It is probably a recent book because I think those books on the false twins weren’t yet out when I finished the other. Hope you can help.
This HaBO was sent to us earlier this year, if that helps with the timeframe.