How to let guests choose either they will being plus 1/ plus 2 when reply RSVP?

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RSVPs on WW are based on guest list names. You may have the option of adding them as Guest Householdlastname, but that seems pretty damn impersonal.

ETA if it is a plus one, you would have Guest Householdlastname, and a plus two might have to be something like Guesttwo Householdlastname. Not sure what the site would do with two guests with the same exact name.

Perhaps plus 2 may include a spouse and kid

If it includes a spouse and a kid, it's not actually a "plus 2". That family needs to be invited by name.

OP plus 2's are not a thing.

You need to enter every person in the household who is invited to the wedding. When one of those people logs on, they should see all the names in their household and can RSVP for each individual.

The +1 is designed for the single adult to bring a date. If it's a family unit, they get invited by name and there is no plus-anything for that household. I don't understand the intention of the +2.

You need to learn the names of your guests.

If it is a truly single person, then that is the only time there will be a "plus one". There is no such thing as a "plus two".

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OP...can you explain the plus 2? Are you considering the actual guest as the plus 1 & their guest as plus 2? This is confusing as heck...