well.. the issue is that the OLDER dog peed over the younger dog's pee..
This is really REALLY common in multi-dog houses. If i were you, i would not worry too much about the older dog, he will stop once you get your younger puppy to stop peeing there.
What you SHOULD do is contain the puppy to the kitchen or other easily cleanable surfaced room. This will make cleaning easier for you and make it less likely that your older dog will want to mark over it because the smell will be COMPLETELY gone once you clean. You also shoudl ALWAYS clean with an enzymatic cleaner like Nature's Miracle. I love that stuff and swear by it. Its AMAZING! Even in the washing machine, it works wonders.
So i'm assuming you dont want to keep the dog in the kitchen ALL THE TIME, and that is great.. but here is where the work comes in (anyone who told you having a puppy would be easy is off their rocker!)
WHen the dog is NOT confined to the kitchen, he should ALWAYS be within your sight, and you should ALWAYS have an eye on him when he is walking around. If he's sleeping, you can do your thing.. just like having a baby!
So if hes up and about, put a baby gate so that he cant leave the room that you are in. A baby gate will be your best friend.
Then comes the task of REALLY learning your dog. You need to learn the little things that your dog does when he's about to pee. All dogs are different.. some circle, some just sniff and squat.. its ALWAYS different.
If you see that behavior, or even an INKLING of the behavior, you just say "NO!" in a loud and sharp voice and pick him up and RUSH him outside... when he pees outside, throw a huge party complete with treats.
Eventually he will learn that peeing outside = treats.. peeing inside = a loud NO!
Another thing that we learned was once the dog learns that outside is the place to go, they will try and show you that they have to go by doing their little indicator, but because they are still young, they will end up going in the house because they physically CAN NOT hold their pee.
So one of the BEST training tools is a bell by your door. You can get one of those long strips of reindeer bells (like the xmas ones) and hang it on the door nob, or you can put a regular bell (like a cow bell) that if tapped makes a noise. Like this one (
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This is the perfect solution because no matter where you are in the house, you SHOLD be able to hear the bell.. We had an issue where cappy would go up to the door, look at it and walk away. If we missed that little tiny hint, he would go in the hosue. The bell was perfect.
To train the dog to use the bell, its REALLY easy. Every time you leave the house with the dog, you ring the bell.. The dog will learn that when the bell rings, you open the door and go outside. You shold do this EVERYTIME you go outside, not just for potty. The trainng will sink in more quickly this way..
Eventually the dog learns that going potty outside = party and the only way to get outside is to ring the bell!!!
Its all basic common sense, but most people dont think on these basic levels..
Let me know if you need more help! We managed to housetrain Cappy in 3 days, but he was a bit older.
Also remember that dogs PHYSICALLY can not hold their pee until about 6 months of age. If you ask anyone who had issues with puppy training, MOST will say that a switch flipped at 6 months old and they just started going outside..its because they can, at that age, actually hold it!
housetraining double trouble - explain this behavior! 
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