My dad and I both have adobe Photoshop. When I initially started mine I downloaded what he already had. After quite a few years we both have new pictures, tags etc.
Is there an easy way that we could merge our pictures. Is there a cloud that we could both download to? We both have approximately 50,000-60,000 pictures.
That sounds like a lot of Gigabytes, and that would be your issue regards online storage. Does your dad live in the same building, or within network range? This getting outside my comfort zone, but I suspect that's the sort of direction you'd be looking at.