how about my son in singspore can i include his name for our china visa application here in PI?

we are filipinos going to shenzen and guanzhou from hongkong on day trips only. we are 5 adults but only 4 are here in the phil. my other son is in singapore now on employment pass. Reading the above Q&A ive learned that we will secure china visa in the phil. Pease advise. thank you.