Well, I guess Jeb may very well be to the right of his father or brother. But, unless "conservative" simply means "being the most conservative of the Bush family" he would not meet the definition for most true conservatives. Jeb is still a big government Republican. Just because he has the (R) behind his name does not make him conservative.
Personally, barring any unforeseen circumstances, I am voting for Ted Cruz in 2016. It does not matter whether he is on the ballot. If he is, I will be happy knowing that the Republican establishment has been beaten back by the grassroots conservatives. If he is not, he will be my write-in vote. I am done voting for the lesser of the evils. I have not voted "for" a presidential candidate since Ronald Reagan. Since then it has been a vote against the other guy. It hasn't been working. It is time to vote "for" a candidate again.
Do you see evidence for that? I haven't followed him closely but I just assume all Bush's are pretty much the same neutral, featureless, worthless RINO inside.