I know of a married couple in EK, and I don't get the impression they have matched rosters. Certainly they don't appear to be on the same flights, and if there is a rule against that, then I don't think that's a bad thing - it could save a domestic on board and also means you don't take a work problem home. It would also prevent accusations of unfair treatment of the crew (favouritism). I have seen couples working together, and it can be a can of worms. Matched roster patterns would be useful to couples without kids, so they share days off. For parents, that means babysitters whenever they're away, so "antiphase rosters" may be more helpful in that respect, though you'd see little of eachother - I know a couple doing that in another company just now. It's a good gesture if the company can accommodate the rostering practice you prefer.