It appears that 11546 Rousseau St, San Antonio, TX 78251 is not in the Jefferson Middle School district.
Click on the link to see the district map; http://www.greatschools.org/school-district-boundaries-map/?districtId=751&level=m&schoolId=11965&state=TX
It is always a good practice to get in touch with the school district to make sure that the home you would like to purchase is in fact in the desired school district.
If you would like further assistance in finding a home in the Jefferson Middle School district I would love to help. You can contact me by phone 210.913.0377 or e-mail Libby@ExquisiteSA.com