We all have baby sisters and brothers at some point in life. We should help them because they are toddlers.
When a toddler is crawling, they are likely to pick up several things and eat them and this is not good. So they need to be watched over and since you are their older brother or sister, you are required to keep an eye on them.
Try playing games with them or sing to them, this helps to keep their minds active. Never scold them when they become distractive.
Give them toys to play with because it is another way of keeping toddlers busy. No one is as active as a toddler; try the do-together crafts & activities to keep your toddler entertained since this boosts their development and learning skills.
Toddlers always cry for a reason and at times it is a way of informing you that something is not right. So it is important to find out what is bothering them, for instance they could be hungry or sitting in an uncomfortable position.
It is the responsibility of older brothers and sisters to look after the young ones at home.