On Wednesdays I pick up my 10 year old son from my parents since they pick him up from school. Usually I'll get a snack, do a little reading up on current events, and then go throw the football or shoot baskets, etc. with him. Lately my mom has been going over to my sister's house which is just down the street and taking my son with her. I wasn't in the mood to spend an hour or two with her spoiled daughter at her house since I had had enough of her kids on Friday when they came over for my sis's birthday. I went to my sisters, said hello, and proceeded to get my son to take him home and spend some time with him. The next day, today, my mom said that my sister was very upset that I didn't spend any time with her and that I didn't inquire as to how the kitchen remodeling was going. I was just not in the mood really to be sociable that day and I do see my sis and her kids at least twice a week. Was I wrong here?