Okay, now that I'm slightly more awake and hubby went on break, I can give more info.
FIL came today to check where we said the leak was. At this point, we've pretty much had to replace the entire pipe system in the house because at one point or another, most of the metal pipes have gone out. Just haven't gotten to the ones in the ground. Since we've had to redo all the pipes, my FIL knows exactly where everything is including the pipe running directly to the house from the city. He is going to cap the old pipe off that is leaking and just run straight from the main pipe into the other side of the house with new stuff. So it doesn't seem like it is going to be as expensive or tough as I originally thought; just need to wait for him to get the chance to do it.
Also, my kitchen sink has been having issues draining slowly the past few months. I've tried snaking the pipes and cleaning the trap and a few other things, but it never fully fixed it. I also always complained that the sink was really shallow and the faucet was really low. I took a nap to wake up to a draining sink with a new deep sink and a nice tall faucet! I think I stared at it excitedly for 15 minutes. The things I get excited about as an adult.. lol.