Who do I get in touch with to block a Quad for my family? Will my travel agent be able to assign the seats?

Only Qatar Airways Sales offices can book the quad seats.

Please contact [phone] or the nearest Qatar Airways Sales Office or Contact Centre to select your seats. 

Visit this link for more details on Qsuite https://www.qatarairways.com/en/onboard/qsuite.html 

Please contact your local Qatar Airways office for further inquiries. Contact details can be found in the following link https://www.qatarairways.com/en/worldwide-offices.html