I haven't gone on a vacation in more than 12 years
Why haven't you gone on a vacation for 12 years in a row?
I have a mother who is getting old and feeble and she needs my care. I love her.
You may have responsibilities with your mom's care, but you need a break. Sometimes people get burned out. Take a vacation and relax.
I'm doing a good job with my mom and I don't need to relax.
If you're fine with not taking a vacation it's alright but at some point you're going to get tired so you should take some time for yourself to relax.