So I really like it. You have my OK. Here are maybe two points you could think about:
1. In the parents' bathroom, possibly swap the toilet and the shower. If you don't have controlled residential ventilation, the moist air tends to accumulate in the shower, which you can better get rid of through the proximity to the window. I am very picky about moisture in the bathroom and possible mold risk. Also, the toilet is probably used more often, so you don't have to walk around the washbasin every time.
2. I would plan the front of the kitchen island (the side facing the dining table) so that you have coasters, salt + pepper, napkins etc. quickly at hand and don't always have to run into the kitchen. It's a small thing, but those are things you need several times a day.