Yes, the bigheads file shows them all matched up. For some, there's no physical resemblance between matching pairs - there's no rainbow-haired boy for example.
The offspring of a pair of parents will usually come from around halfway between their respective positions on the grid. That means that, if the parents are matched, their children will usually be clones of their mother or father. There is, however, a random factor built in, so sometimes a "rare" child will appear, who might bear no resemblance to their mother or father.
_________________________
To err is human; to arr is pirate.