Vixen In Disguise (How to Marry a Hardison #1)
Kara Lennox

Seeing the prodigal Hardison brother back in his family's embrace made Anne certain they couldn't be together. Wade wasn't the footloose lover she'd thought, but a marriage-and-kids man to the bone. The secret she'd kept from him was unforgivable. But resisting Wade proved impossible, because inside, she was Annie -- and she loved him with all her reckless heart.
How to Marry a Hardison
Harlequin American Romance #934, August, 2002.