I went to visit my DB's family for few weeks. They live in another country and I flew with my baby and toddler. I am very conscious of following routines for my DC, especially food times, nap times and sleep routine.
They don't seem to have any routine with their DC. Their younger DC is same age as my older DC. I always used to plan any outing in the evening after both my DC were finished napping and we're fresh and content as I want to avoid any meltdowns and going around with a baby and toddler is hard as it is. Baby was 7 months and older DC is 3.5 years old.
My SIL made a comment that they never made any changes to their pre kids lifestyle and they made their DC to fit in their lifestyle, which meant their 3 yo DC would be awake till 1 am on the weekends when they are out and about with him, getting only 6-8 hours sleep and they have already cut his nap since he was 2. He hasn't got any fixings sleep routine and he sleeps around 11 pm, when they go to bed and wakes at 8 AM. They are not strict with processed food etc and some days he'd just have crisps and biscuits for lunch if he wants. He's very short and under weight, probably something like under 4th centile for his age. She indirectly said that I should be doing whatever I want and not worry about my kid's nap times and feed times etc. I think she's AIBU but wanted to get some perspective from others on this.