Death and Mourning

Good Morning Rebbeim - My (Jewish) friend just passed away. Unfortunately he had gone off the derech in a big way - married out, converted to Christianity (or so he thought), baptized his children - the whole nine yards. Is it proper to arrange Kaddish from him? And if his parents don't know the Hebrew name of their son (or their own for that matter), how is Kaddish said? Thank you.

Dear Rabbi, I am newly observant. My parents are close to 90 years old and my mother has directed that her body be cremated. I have tried to bring up this issue with no success. Do you have any advice for me? Perhaps you know of an article I can send them which may be easier than me speaking to them about it. Thank you.

Person's memorial plaque shows Oct 1, 1947 as date of death. The Hebrew year is 5708. It shows a letter (which is cut off; it might be BET) This is followed by a space and then דחוה׳מ סוכות Please explain what these words mean? What is the Hebrew date in Tishrei that this person died?

Why is suicide considered to be wrong?

Is renting a hotel as a place to sit shiva allowed? I have seen many people do it, but never anyone Orthodox. Though hopefully it is many years away, I realistically know we will one day have to sit shiva for a particular relative who is in a nursing home. Our house is not a practical place to have over tons of shiva visitors.