Should my child meet her brother...?

[jasmine]

Should my child meet her brother, who was made out of infidelity on my husbands part?
When I WAS married, my husband cheated and got another girl pregnant. He is no longer with me or her after continuing the back and forth lying and cheating on us. He ended up getting yet another girl pregnant and is now with her. Military men...ugh! Since she and I were in the same boat we have no hard feelings, but it will still be hard to meet her after knowing she was sleeping with my husband when I was, but now we have two innocent children in the mix. Should my daughter meet her brother? And when? She is five and his mistress's son is 4. What should I say to my daughter in the future. It is hard enough he is no longer in her life after broken promises and being there before. Help!