How do I randomly generate sprites attached to families

in my screenshot i show my randomly generated city.

how do i set my randomly generated cornerstones and roofs to this city? ( i have 3 roofs and 3 types of corner stones)

[attachment=0:15xgvbk2][/attachment:15xgvbk2]

I set my walls to a family called fam_walls

and then set a for each fam_walls

create roof>roof.width = fam_walls.width

create cornerstone_left> position = fam_walls.x, fam_walls.y > cornerstone_Left.height = fam_walls.height

create cornerstone_right> position = fam_walls.x, fam_walls.y + fam_walls.width > cornerstone_right.height = fam_walls.height

I also did a randomly generated number 1,4

num = 1 >create roof_1 ...ect...ect...

but in all honesty, its not working. The roof and cornerstones are not showing up.

I just need theory to point me in the right direction, I don't necessarily need someone to DO IT for me. (I think)

Thanks,

Gathos.

Well.. no answer. That sucks. Any Ideas of where to even THINK about looking?

to simplify for possible ideas, I'm trying to randomly pick/create a sprite and mirror it on the other side of a tile sprite.

Thanks for looking guys.

I appreciate the people have been just viewing to see if they can help.

Gathos.

Any chance of providing a capx?