the siamese 4x4 isnt that hard to solve except once you get to parity
i cant figure it out

What for to create a new theme about a siamese cube? All is here:
http://twistypuzzles.com/forum/viewtopic.php?p=240916#p240916
It is really difficult to see themes and to insert the message there?

okay no offence but that wasnt helpful at all
that whole document is about 3x3 and 5x5
and all i was asking for was parity for 4x4

In the instruction is said:

"Cube 5x5x5 - it is the smallest cube that combines all the features of odd and even large cubes. Therefore, the principle of solving of the large blocks of Siamese is on the basis of solving Siamese cube 5x5x5." (Beginning of the chapter 4).

Therefore safely apply algorithms of a cube 5х5х5 to a cube 4х4х4. Or use universal algorithm (U2 r')*5.