Will my credit score go up if I start a joint credit account?

I have 4 credit cards and I've had them for about a year.. My credit score is 627 and a family member has a credit score of 800.. If we start a joint credit card account will my credit score go up?|||You might get better terms and a better credit limit if the family member is the primary on the account, but it will still be a new account and it will take awhile for your scores to go up dramatically.





Since it's a family member you might see if they will add you as an authorized user on one or more of their existing accounts that has always been in good standing, low utilization and has a long history. Once the account(s) begin to report then that would probably give your scores a greater boost then it would by opening a joint account.