[QUOTE=sj44;6708365]Thanks for your advise. I actually picked something up from the store on my way home tonight, it was a small gift that I knew she would like.
After she was so mean, I was just really certain that I would never do anything to help her again, but like you said I'm helping him and not her. Thanks again

Yup. If you had ALWAYS gotten her a gift from both of you, sign both. If gifts have always been just from him, not a time to start adding you name. If you always got her a joint gift, stopping so abruptly would stoke the flames.