tm,
i am not making any statement about the difficulty of winning the case. but i think it merits a review, cuz the likelihood of foul play is high. that is my point. and i think quincy's point, as well.
i have a suspicion that the op has a better chance though, than others on this site are giving him. there is simply too much that doesnt make sense, if the father really didnt want his son to have anything.
most second marriage couples leave stuff to both sets of kids, evenly - that is standard, just like giving to your own kids evenly, is standard.
when a person wants to do something non-standard, then they better make damn sure that it looks like it is their intention.
the judge's real goal is to make sure that the testator's wishes are carried out. and this case makes those wishes VERY SUSPECT. which is why i give the op some sort of real chance to present his case, and have some success with it.