Boston Terriors having trouble with housebreaking

Question
Hello and thanks for your help / suggestions,
I have two Boston Terrior's one of which is 8-9 and the other is about 1 1/2.  They both seem to have trouble with going to the bathroom in the house.  I feel like the older one only really goes when she has to, but the younger one i will let outside (it almost seems like she doesn't equate outside with going to the bathroom) she will come back in and as soon as i have my back turned she has pissed on the ground.  They are both spayed females.  I have tried most of the traditional techniques for house breaking, to no avail.  I also feel like they are much worse in the rain and winter becuase they just dont like the wet or cold weather.  I also feel like as soon as i make some progress one will slip up and that seems like it starts a downward spiraling effect for both of them.  Almost like it gives the other one a free pass.  I keep them in the kitchen (no carpet) during the day while im at work and cage the younger one (she doesnt pee or poop in her cage)but i wish i could give them more room the play around the house. The younger one also sleeps in her cage and I feel like thats a lot of cage time and makes her more energetic when i come home.  This has been going on for way to long, and I would really appreciate any help.

Answer
They may be marking, or when one has an accident, the other may feel it needs to over mark it.  Try to recognize when the younger may need to go out.  If she starts sniffing around one of her favorite areas, take her out.  When you think it does, take it our and walk it around.  If it eventually goes, praise it lavishly.  

The key to most behavior problems is approaching things using the dog's natural instincts.  Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog.  Life is much easier if the 2 legged pack members outrank the 4 legged ones.  You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/  For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm