The Tomlinson children didn't get to be children... Louis had to take care of his sisters... so did Lottie last year.. and Fizzy and the twins had to grow up too...
1- they all got be children just like any other children with siblings
2- almost 90% of the world has helped their parents/relatives with young siblings, that doesn’t mean they lost anything. In fact, this teaches kids responsibility and care
3- Jay was there for her kids always. So was their grandparents and dad
4- they’re siblings and they love each other and I’m sure Louis would give up everything to look after them (just like would the others)