Anyone who has worked in India will tell you that there is no way for this to work without hiring adequate help. A cook and a full time nanny are a must if both parents are working outside the house for long hours. This is in addition to the regular part time help. Your brother folding laundry if mom didn’t get to it and your SIL making breakfast and leaving will all work out great if there is a cook to do the rest of the cooking and a nanny to help with the baby. Otherwise both are just taking advantage of the parents who are unable to take care of the house and the baby. I have many relatives in this position(parents of sons and daughters) and it’s sad to see people dealing with babies and household responsibilities instead of enjoying their retired life playing with the said babies and then relaxing in peace. They do resent it. They just tell these things to the rest of us instead of directly dealing with their errant child.