I don't understand either of the two topics, so it's hard to get specific about what's wrong with them. A wild stab, though:
1. "familial self-discovery" to find out what "we" are good at? It is a personal statement, not a group statement. i can't see - even if law-school was an effective forum for self-discovery of that kind, even if they would want to hear that you're applying to, and want to attend their law school, to find out if you (singular or plural) would be good at it.. Why should they let you in over someone who is passionate about the law? It would sound like the PS of someone who can be predicted to drop out after the first semester, after they've discovered that well maybe they're not so good at it (1L, by all acounts tests your commitment to studying law) ... Surely there's a better PS theme than that?
2. I want to study law because I want to head up a civil engineering firm? Why don't you get an MBA - that's the first thought that wold sping into my head. Plus, that's not even what you want to do and would therefore write about it without the required level of sincerity.
Write about yourself; write about something that's mportant to you. Don't force the "why I want to go to law school" essay on them when you don't have to. That way you have better odds of writing something nice, something that will make you semm likeable and interesting..