Large Yellow Rose

Large yellow rose in my son's back yard. This rose plant is over ten years old. The first eight years or so, my son has this inside the house in an open-air foyer. The plant was about three-feet tall then. Two years ago he moved it to his garden. The plant is now almost six feet high. It has two other roses on it but they are small. This one is more than four inches across the top of the flower.