It's encouraged to look out for your family members.
James was at the public pool with his little brother and his friends.
James wanted to swim.
James played in the pool with his friends on the shallow side of the pool where his brother was.
James swam in the pool with his friends, ignoring his brother altogether.
James, his little brother, and James' friends all had a great time playing at the pool.
James' little brother went under the water and almost drowned in the pool.