This is NO surprise. Joseph Jackson cheated on Kate ALL THROUGHOUT there marriage, even before they became famous. Katherine was VERY EXTREME about the kids being Jehovah's Witnesses, but only three kids out of the nine (Rebbie, MJ, and Latoya) because witnesses, (Rebbie served where the need was great) and MJ and Latoya were always going out in field service inbetween tours, TV apperences, album recordings, etc. MJ got reproved for the Thriller video and Latoya did the infamous playboy cover and that was it for them in JW's land! lol.
She sould have divorced him a long time ago (Kat). She actually did file for divorce back in the 70's and early 80's.