I don't know if it is/was planned, but when we have shared a table (most of the time, we've had a table just our family), the "matches" have been remarkable. We have one daughter. We shared with another family with one daughter, although she was a little younger than ours. Another time, we shared with a grandmother/granddaughter pair travelling together where the granddaughter was a little older than my daughter. In each case, it worked beautifully.
A third time, we were asked at the second night's dinner whether we would mind sharing a table with "the family over there." Our server had a very good reason for the request, which he told us...We said no problem, and he said that he'd check with the other family, then let us know. We moved the 2 families together despite my daughter being significantly older than the other girls, and she became the "big sister" for the trip. The little girls would squabble over who got to sit next to my daughter at dinner, and we'd usually do the shows together!
So...my take would be that if you are with another family, it very well may be a family with children of about the same age/sex as your children.
And, you can take your children out whenever they have finished eating without fear of being rude.