Mulitple Marriages & Bridal Shower Etiquette

Should a bridal shower be thrown for my sister-in-law? She was married once for a few years, divorced in `97. Her fiance has been married three times before. His most recent divorce was finalized near the end of `03/beginning of `04. They are both in their forties and have been living together for nearly three years. They are talking of a small intimate, family only wedding and have not yet set a date.

While this has nothing to do with the shower question...the fiance has five children (possibly six) with his previous wives, ranging in age from 16 to two.

With this limited information, can someone help provide some insight regarding bridal shower etiquette in this situation?

Thanks!