These days, I help my kids studying English and maths. I really enjoy learning with them very much. I can see they are improving with each exercise. They also help me doing housework and cooking sometimes because I can be lazy sometimes.

These days, I help my kids with learning English and maths. I really enjoy learning with them every time. I can see they are improving in every excercise. They also assist (help) me in doing the housework and doing the cooking sometimes. I can be lazy sometimes.

These days, I help my kids with their learning of English and maths. I really enjoy learning along with them. I can see them improve with every exercise they do. They also support me with the housework and cooking now and then. I can be lazy sometimes. When you say that you "enjoy learning with them", it means that you yourself are also learning. Is that what you meant to say? "With learning English" is fine, but "with their learning of English" is better because it is more specific. "Maths" is fine. It is the British term. In the U.S., it sounds strange. Over here, we say "math". I changed one of your "sometimes" to "now and then" so you wouldn't use the word twice. Your "laziness" has achieved notoriety worldwide!