As markharf suggests, there really are too many variables to consider at what is still the embryonic stage of planning such a huge trip.
fwiw. [as Mark suggests] I'd get a bike for each of you (which suits the size/strength and experience of the respective rider) and plan a shorter cross-country style trip or two next year in and around the United States - Colorado and Utah for example, or Montana/Idaho/Washington, or even south to New Mexico & Arizona - and basically get a feel for what it's like travelling as a [family] group on individual machines.
Not only will you all gain valuable experience (both as individuals and as a group), but you'll soon know what it is you don't like about travelling/the bikes you've chosen just as much as the things you do...
And if you're still all in agreement, then spend next winter planning your 2025/26 'big' trip.
Jx
ps. there is also a huge difference between a One month trip and a Three month trip with regard to where you can go, and whether you fly/rent or buy/ride your bikes - again, this ought to become clearer after a couple of shorter trips next spring/summer.
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