The phrase "to establish that tradition" means to create or set up a practice or custom that will continue to be followed in the future. Full definition
Infant massage establishes a tradition of touch that enhances your relationship with your child for years to come. (infantmassageusa.org)
Which is one of the reasons that I have always tried to establish traditions for my children. (vintagemamascottage.com)
Creating shared meaning by establishing traditions and rituals of connection is not just for couples — you can bring your whole family together in much the same way! (gottman.com)