AITA for looking after my grandson against daughter-in-law's wishes?

I (49f) have recently had an argument with my son (25m) and his wife (24f). The details are too long to get into, but suffice it to say that neither side behaved well and I have since regretted my actions. As a result son and DIL have asked for some space between us for just a short while so we can all cool off before talking again. This is something that made sense to me and I agreed. I was a little sad because I used to go over there and look after my grandchild, and I was going to miss him. But son said it was best for now for me to not be involved with him for a while.

The conflict happened when I went over to my daughter's (22f), son's sister, place. I often drop by in the evening with cookies, as we live in the same apartment complex. That day my daughter happened to be watching my grandson (son and DIL's child) for their date night.

My daughter did not know about the big fight between me and son as we had all agreed to keep family drama to a minimum until we sorted it out. We talked for a bit, then while I was there she had an urgent phone call from work and asked if I wouldn't mind looking after grandson while she took it. I was uncertain because son asked me to not care for him until we talked again, but I also wanted to let my daughter take the call and there was no one else in the apartment. So I said yes.

I was playing with my grandson when a knock sounded. When I went to get it, with grandson in my arms, I saw it was DIL at the door. She completely freaked out. Immediately took grandson away from me while saying a string of choice words in my direction. I tried to explain but she walked away before I could finish.

Now son and DIL are even angrier with me. AITA for looking after my grandson?