Đoạn văn của bạn có một số lỗi ngữ pháp và cách sử dụng dấu câu. Dưới đây là phiên bản đã được sửa:

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My parents are very busy, and they usually go home late at night. So I try my best to help my family clean the house and do housework. I sometimes cook meals; I can cook some simple dishes, and my mother and sister like them very much. I usually wash the dishes after a meal. I rarely clean the bathroom with my parents. It's very fun and helps my family gather and understand each other. Watering the flowers and plants is my favorite thing to do the most on the weekends. It helps me learn about lots of trees and flowers. I hope my parents are always happy and feel relaxed when they come home after a busy day.

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Một số điểm đã được sửa:

1. "My parent" -> "My parents" (số nhiều).
2. Chèn dấu phẩy và chấm câu cho hợp lý.
3. "help my family gather ,understand each other" -> "helps my family gather and understand each other" (sửa lỗi ngữ pháp và dấu câu).
4. "Water the flowers and plants is my favourite thing i like do the most" -> "Watering the flowers and plants is my favorite thing to do the most" (sửa cách nói cho chính xác).
5. "it's help me know" -> "It helps me learn" (sửa ngữ pháp).
6. "my parent are always happy" -> "my parents are always happy" (số nhiều).

Hy vọng phiên bản sửa này sẽ hữu ích cho bạn!