I have been researching a daughter line and found that 3 sisters had all married men from England in the late 1890s. Further investigations revealed that 2 of the 3 men were jockeys. The families lived in Tervuren, a village to the East of Brussels. Was there a horse racing track near Tervuren or in Brussels where the men could have worked in the time period from 1890 to 1910? If anyone knows about the track, could you let me know how I can find out more on the site?

There are three possible candidates, but you may need to "google" since I'm not sure which ones would have existed at that time.
There are the Boitsfort, Sterrebeek and Groenendael racetracks ("hippodrome" in French). Sterrebeek would be the closest to Tervuren, but I have a feeling that it was only opened between the two world wars.
All 3 are on the same side of Brussels as Tervuren, though clearly what today is a 15 minute drive in a car today would have have represented a considerably longer journey in the 1890s.