My credit score went down b/c of my children's student loans? Is there anyway I can have them removed?

My children are now 24 and 26 no longer living at home they have graduated and have jobs. While in college they needed a co-signer I didn't know this would affect my credit. They are paying on time and not delinquent. My husband would like to sell and buy a new house I don't want this to hold me back. Also does anyone know the website for a free credit report. The one I used charged my credit card for monitoring. I was able to have the charges removed but it was a hle thanks