Living with aging parents can be very good for one's conscience - being there in case they need you, having more time with them when you know that time is becoming limited.  

It is also very challenging to keep one's sanity, for pretty much the same reasons.  

This morning I once again comparing life with my Mother to life with a toddler.  I couldn't even stop to take a poop without being needed for something, and then not appreciated for having stopped pooping to clean up her mess - not that I needed appreciation, but it's kind of stretch to say that they don't see me unless I need the wash machine or the microwave.