Eva, I understand that you are a beginner so please take what I say in the right spirit!
And, welcome to Lightroom Forums!
The dilemma that you have posed is not primarily a Lightroom problem or a post-processing issue in general.
The problem with the posted image needed to be solved in-camera.
I see that you have decided to shoot directly into the sun. Several problems emerged. The one that has troubled you is the sunspots however it also seems that you elected to use an "auto" mode for exposure and the result is a terribly underexposed subject (family and dogs) and a hopelessly overexposed sky in the background. I don't know if the original image was a JPEG: if it was then the white balance is all wrong.
In general, the best way to solve these kinds of post-processing issues to avoid them in the first place. No amount of post-processing can substitute for understanding light (an absolute prerequisite for good photography) and camera technique. Simple attention to detail, with camera in hand, could have resulted in a brilliant image with no post-processing issues.
Whether anyone will be able to acceptably rescue this image - we will wait and see.
Possibly for yourself this issue should be viewed as a learning opportunity to improve your photography.
Tony Jay