If you want a camera that quote has it all and quote, then you might be waiting for a long time the Nikon D850 is it good all-around camera. The new Canon 6D Mark II is a really nice Imager. I have shot both aps-c and full frame cameras for over a decade now, and my preference is for the full size sensor because there are so many more lenses that were designed to be used on a 24 by 36 mm capture size. For example old kit lenses that were originally designed for film cameras from the 1990s are quite useful for full-frame digital SLRs.
Canon ef-s lenses do not work it all on full-frame Canon cameras, so none of your lenses from your Rebel will work on anything but a Canon crop-frame body.
The big issue is that a crop frame camera makes the vast majority of the Canon lens line lenses into something they were not originally designed to be. For example,with a Canon crop body and an 85 mm lens, you must stand over 35 feet away to get the same picture that you get with a Canon full frame at exactly 20 ft. With the same exact 85 millimeter lens . I am talking about a picture area that is 8.47 ft tall, just about the perfect height for a standing portrait of two people, with room below them and above them for their heads and feet. With a 24 mm lens setting the full frame camera takes a fairly wide angle picture, while with a crop body you have a roughly 42 mm semi normal equivalent lens.
In Social and family photography my preference is most definitely for the full frame body. It is just easier to work with in small spaces, like in living rooms, bedrooms, offices Etc. Outdoors or at long distances there is a lot to be said for an aps-c camera. One thing about the full frame body is that when you look through the viewfinder at least, the image is quite a bit bigger, and I think this makes seeing what's going on through the lens easier. If you shoot in live view. I don't think this is much of an advantage.