Thanks for your reminding of the repetitions of some of the words. I've gone through the composition, spotted and amended some errors and remove the words repeated as much as I thought necessary.
I hope it is now a better piece of writing and look forward to your comments.
Thanks very much indeed for your constructive comment and help.
One sunny day, Father suggested going to the beach. Brother and I were happy to hear that, as we had not been there for a long time. Father drove Mum and us our destination.
On reaching the place, all of us went to look for a spot to put our things. We found one under a shady tree. Then Father, Sister and I went to the changing room to change into our swimming suits. Then we went for a swim. Father taught us how to do it the correct way. We had a wonderful time learning how to swim. About half an hour later, I told Father that I was tired. We went back to where Mother was. She was engrossed in a novel.
Soon it was time for lunch. We ate the food that Mother had cooked at home. After we had eaten our meal, Father decided to stay with Mum, and read the newspaper which she had brought from home.
Sister and I strolled along the beach to look for a spot to make a sandcastle. Having found a spot, both of us worked together to make one. We were very satisfied when we had finished building what we set out to do because it looked beautiful.
By then it was evening, so Father said it was time for us to go home. Sister were I were so tired that we dozed off in the car on the way home.