Quite honestly in my opinion, having to draw the line somewhere, I would omit aunts, uncles, nieces, nephews, cousins, and in-laws.  If your spouse is a legal citizen, that will take care of the in-law issue. It gets endless after that.  A lot of people don't even know all of their extended family members.  They very well could be terrorists for all you know.  You choose to come to this country, leaving relatives behind is part of your decision.
Again just my opinion.