Since so far (at least that I know), she isn't openly directly confirmed. There is just one possible son "that is probably hers". But thats all. I can't put into article something so ambiguous. Another point is that harem part of article isn't simple "harem list" but there will be short info about future of each girl. And for Le Fay there isn't any info at all. But there will be at least brief mention about stated son.