Leaving my kids with my husband, would I be wrong?

We are going over my MILs house for Christmas. However my daughter needs to be picked up from college. She finished the semester but is actually transferring to the college down here and is moving back home to continue college. My daughter is almost 19. Son is 15. Youngest is 4. The problem with making the drive to get her is we would be going the opposite direction and driving to my in laws house would make the drive like a good 16 hours which would be too much for my 15 year old son. So what I'm thinking is my husband takes the kids to his mom's house and I go get my daughter and just me and her make that drive. Plus we could get some one on one time. We didn't get a lot of that the last few years because a majority of my attention went to my 15 year old. When he was 12 he went through something extremely traumatic that made him go into a long term age regression. He sometimes comes out of it and with therapy he comes out of it more often but he is basically a toddler in a teenagers body. His therapist explained it as his brain did this to protect him. He regressed so badly he's not even potty trained anymore and the last few years of trying he will do okay and regress again. It's depressing . Especially when our 4 year old is potty trained but my 15 year old isn't because of something terrible happening to him. So obviously my attention went to him because he also became extremely attached to me. He sleeps in the bed with me and my husband. Life has been really hard the last few years which means my daughter got out on the back burner. It put us all through a lot. So the trip with just me and her would be nice. I just wonder if it would make me a bad mom because I would be separated from my son who is attached to me for a day or two depending on when and how long we drive. My husband thinks everything will be fine and he will have distractions. He knows how to care for our kids and our sons hygiene. He's telling me our daughter probably needs the drive with just us.