It’s hard to know what situation you want to be prepared for.
What do you mean, “perilous” in wind? How strong is the wind and how big are the waves that you expect?
To carry two to three people, you likely need a fairly large canoe, if all three are adults and they are fairly big people. For two reasonable-sized adults (these days, that may not mean “average sized”) and one child, most general-purpose tandem canoes will likely do the job if the wind and waves are manageable.
It might be a little hard to mount a 4-horse motor to an ultralight canoe, since often the gunwales are semi-tubular aluminum of small diameter, rather than squared-off vinyl or wood, but it should be easy to rig up a motor mount for one that’s a little more rugged. Do you really need a motor that large? If so, a square-back canoe might be better, or perhaps a 12- to 14-foot “regular boat”. By the way, if conditions are truly perilous for a canoe, I don’t see a motor making the situation much better, but if all you are worried about is controlling the boat when the wind blows hard, yes, the motor will help.
Bear in mind that many stock canoes won’t have enough flotation to keep both ends at the surface once capsized if a motor is attached. Some might even sink. Most are really only equipped to keep from sinking once swamped if not much of anything heavy (that is, heavy and dense, since heavy items which float don’t matter) is attached. Here again, a standard boat is likely better, and is less likely to ever tip as well. You may never find yourself in that situation, and most people don’t, but it’s something to know about. You can add flotation if you want to be more prepared for that.