Cross-clan should be viable -- it's pretty much the same thing as, say, a Russian and a Jamaican (pulling nationalities out of a hat here) getting together and having a child. Same species, just from different regions and lifestyles.
Cross-race, again, it's said to be possible but rare. Something to consider with the concept is the strain a mother might go through with a cross-race baby. If the sire is bigger or has a vastly different body configuration, there's going to be a risk of problems. This problem DOES exist in the real world between humans at times (a woman from a family/bloodline that's typically petite getting pregnant by a man who's family/bloodline tends towards producing 6'6" football players), but it's better illustrated with designer dogs/dogs that got loose.
To highlight an extreme case, a Lala would have a VERY hard time carrying a baby that was fathered by a Roegy. Totally disregarding how the Lala didn't get split in half while getting pregnant, the resulting baby would be too big for the Lala to carry without severe complications. Actual birthing would likely require a cecearan to be performed. In all likelihood, Lala with anything else would be a Bad Idea in general. Even Roegy to Hyur and Elezen to Miqo'te would probably run risks.
Cross-race, again, it's said to be possible but rare. Something to consider with the concept is the strain a mother might go through with a cross-race baby. If the sire is bigger or has a vastly different body configuration, there's going to be a risk of problems. This problem DOES exist in the real world between humans at times (a woman from a family/bloodline that's typically petite getting pregnant by a man who's family/bloodline tends towards producing 6'6" football players), but it's better illustrated with designer dogs/dogs that got loose.
To highlight an extreme case, a Lala would have a VERY hard time carrying a baby that was fathered by a Roegy. Totally disregarding how the Lala didn't get split in half while getting pregnant, the resulting baby would be too big for the Lala to carry without severe complications. Actual birthing would likely require a cecearan to be performed. In all likelihood, Lala with anything else would be a Bad Idea in general. Even Roegy to Hyur and Elezen to Miqo'te would probably run risks.
