Dealing with the financial mistakes of my past - Opening up credit under my name for relatives

As some of you may or may not remember, I came here not too long ago asking for suggestions on my goal towards paying off my student loan. Anyways, long story cut short - I'm on track and everything is going better than expected. I ended up taking a bit of a risk and shaving off 5k off my emergency savings fund which currently has 11k left on it to put towards my student loan. So right now, I only have about 4.5k left with my student loan. I figured with all the interests I had, it was better paying a big chunk it off then continue to face the reprucussions of having a high balance and paying the beautiful Sallie Mae the profits it makes off of interests fees. I'm basically going to put 1k each month until I pay it off whole.

Anyways, the point of me posting here is not so much my student loan. I've been checking my credit score every now and then with creditsesame. Everything looks good up until to the point where I get to some of the past mistakes I've made. About 7-8 years ago, back when I used to live with my parents and had pretty much no clue into the world of finance AT ALL - I opened up a credit card under my name for my dad who at the time said it would help my credit. The second mistake around that same year was opening up a credit card for my sister and brother in law to help them open up a store credit card. They (sister) said it was a small $500 purchase and they would pay it off. Fast forward 8 years later, I'm on track with everything I have under my own belt - Paid off nearly all my student loan and all that is left is my car loan which is a 2k loan. I checked my credit score and history with credit sesame, I see the huge balance that my dad still has yet to pay off - about 10k and my sister who now has 4k on the credit card. I've been telling them for 2-3 years now to pay it off and with all the financial drama that's been going on with them, that never ceases to finish, it has not gotten any better. I made some huge decisions in my life, mostly sacrifices to get to where I am now in life. I'm much more happier and settled with where I am then where I was years ago. I'm also absolutely distant from how my family is in the financial sector. They are good about paying off the "minimum" balance and not being late; as I've brought this up many times to not to be late on payments. They are able to commit to at least that, which I'm thankful I guess. But it does not seem to have gotten any better. My sister's husband got laid off and he's on unemployment. My sister does not have a job. My dad is also struggling with his house mortgage and other bills.

This was my mistake, so I accept all responsibility; but I'm asking here to see if there is anything I can do to expedite this process or if I can get any suggestions to see if it is even possible to get the two cards completely off my name and transferred to them so I don't have to worry about liability / late payments / etc. I'd like to have and maintain a good credit, build it up so I can eventually get as good deal as possible with future purchases such as a house, but these extra balances are hampering my progress and just annoying the hell out of me. I know I'll probably just have to deal with it, so be it, but again if there are any suggestions for someone who has been in a similiar situation, especially family, please let me know.