In the Pratt family there were 12 total wives. Notice that Eleanor Jane McComb McLean had a husband before (this fact has historic value). She divorced and shortly thereafter married Parley P Pratt.

You can see that Mr. Pratt's first wife is 10 years older (she has a gap of +10 years). Whereas Martha Monk was 18 years younger than her husband

While Mary Ann Frost did marry Joseph Smith, in this case she was allowed to remain with her existing husband, Parley P Pratt. Therefore, the marriage wasn't terminated, until she got divorced in 1853. This highlights the fact that during the Nauvoo period of the Mormon movement, plural marriages sometimes meant that the wife would still live with her current husband.

See other interesting families in the gallery