Welcome to the forums.
In all cases (family included), you would do well to consider a smaller bike for a season or so (maybe the Vulcan 500?). The problem with the big bikes isn’t just the weight, it is also getting comfortable with the power and controlling the bike using the clutch, brakes and throttle. Those three don’t need strength (though they will give your hands one heck of a workout). They need fine control and repetitive practice. The smaller bikes have less power and are generally more forgiving for the types of mistakes inexperienced riders make.
Maybe you three can chip in together for a bike to share for the summer while you each get comfortable with riding? It isn’t really considered the wisest choice in the world to start off with long group rides with a bunch of inexperienced riders anyway…
Just my two cents. Anyone need some kindling? That darn soapbox keeps popping up…