The parent test , And mother makes three

The Parent Test by Elizabeth Duke

A wedding for baby's sake.... Roxy Warren was abroad when her baby niece was tragically orphaned. Little Emma is now in the custody of her uncle, Cam Raeburn. Roxy is furious! Cam is a playboy and knows nothing about babies! When Roxy arrives to stand in as Emma's mum, she can't forget the steamy kiss she and Cam once shared. He's still as gorgeous as ever but they both want custody. Cam has a solution - marriage! He gives Roxy a month to make up her mind - a month in which to prove they can be real parents to Emma - otherwise the custody battle begins!

And Mother makes three by Liz Fielding

Stand in mother..... When Bronte Lawrence reads a letter from a little girl claiming to be her daughter she knows there must be some mistake. There is - little Lucy Fitzpatrick's letter has reached the wrong Lawrence sister. Her career - minded sister might not have wanted to be tied down with a daughter, but Bronte is ecstatic at the thought of meeting a niece she'd never known existed! Only James Fitzpatrick mistakes her for the mother of his child, and Bronte finds it all too tempting to slip into the role. And it isn't just for Lucy. Fitz is dark, tall, handsome and he's a great dad - a compelling combination. But what will happen when Lucy and Fitz discover that Bronte isn't quite who she seems?