At this stage, your little one is capable of handling small responsibilities. 4 to 5 years of age is good enough to let your child be a part of small homely chores. Asking him to help you out with simple activities like watering plants, cleaning their room, sorting their toys, ensuring everyone is at dinner at a specific dinner time, etc. is necessary to make the kid responsible.
What you need to know
Once your child will know that yes this task has been bestowed upon them and they have to do it, a sense of responsibility will start inculcating in them. As your child will grow, he will ask you for more responsibility and will feel more like a part of a group called family.