I know of 2 who were offsprings of CX cabin crew but they both didn't make the grade (one failed the initial and the other failed medical). As to your other question regards ex-PAL pilots at CX, they did interview a few after the 1998 strike (according to a friend of mine who is a training Capt at CX) but as far as I know none were taken. However, I know of 2 Fil-Ams a CX but both were flying out of the US before they were hired.
The CX cadet program is very competitive and requires great prep in order to make it. Also the current pay package is sliding and as you can read from the Fragrant Harbour threads, it is not worth it anymore.