Hmmm.... I am pretty sure they would be mainstreamed. Definitely Sadi would be, and I assume Ali would be as well. I know the one high school that I briefly worked at had all the high functioning kids mainstreamed, and others in separate classes. But the "others" I am talking about were extremely disabled... unable to speak, in diapers, mentality of 5 year olds. I worked that class for a bit and was astounded by the fact that they were even IN a regular public school. Though it was mostly a physical therapy and day care class, there was some educating. But really, they were the profoundly retarded (and I don't mean that in a derogatory way, I just can't think of a better way to say it) and could not by any means have been mainstreamed. But I know that there were many kids mainstreamed, and though I never had a child with Downs in my class, I am almost positive that there was one child in the elementary school I was in that was in a standard class. I think she had ESE classes for a few things (but mostly for therapies... speech and occupational, and maybe for reading) but for the most part she was in the regular classes. This all runs together for me, I am trying to pinpoint this exact child in this exact school, to determine what her educational experience actually was, and I don't think I'm doing too good a job nailing down the details. But at SOME school that I was in in MN, I know for a fact that there was a child with DS mainstreamed into standard classes except for a few classes. There, that's all my tired old brain can remember.
If you want them mainstreamed, I don't see why they wouldn't be. I know Sadi would be, and pretty sure Ali would be as well.