SOLVED: Harlequin, estranged family and a limo

I'm sure this is a Harlequin. I can't remember much. H and h are married. It seems like they are married because they are guardians of a baby (I think a girl). The h is estranged from her family but at the end of the book she has gone home to talk with her mother to find out why her parents and siblings don't like her. The h has told the H she wants to go alone. Her mom begrudgingly lets her in the house and mom tells her something along the lines of maybe mom had an affair and dad always thought the h belonged to the other man. The h stumbles out of the house and maybe through a gate to get to the road. I think she took a taxi to get there. Despite her telling the H she needed to confront her family alone, the H is there in a car (I think a limo) when the h stumbles out. The H holds her in the car while she cries.

It's not Vengeful Passion by Lynne Graham but it does seem like it's by one of the big name authors.

ERROR in my recollections: they aren't guardians of a baby, it is their baby.