The best PS topics are gonna be those where you are acting, not those where you are being acted upon. So, topic 1, although done a lot in personal statements, is actually not a great PS topic--precisely because it is about what happened to you, and not about something you did.
Also, topic 1 is more of an undergrad PS statement topic. For a law PS, generally you want to write about something you did as an adult and recently--not something that happened to you when you were a kid.
This doesn't mean you couldn't fit in a mention of your family background in whatever PS you do write. It would have to fit gracefully--but an aside like "Growing up without a father at home made XY&Z even more challenging" or "AB&C is the particular outcome of my having been raised by my grandmother." So you could slide the subject in without focusing your essay on it, in other words.
You could probably write a really intriguing PS about mortuary science...or a really dreadful PS. You should probably try it out and see.
Get crackin'! October is roaring up here--gotta get that LSDAS file complete--