I struggled with this as my tree expanded to several genrations and siblings.
Initially I simply made multiple 8 /12 x 11 prints and taped them together but it got a bit messy.
I found a great service at Staple (Brueau en Gros) where they are all set up to do self serve printing or larger poster size prints in color or black and white.
you have 2 options...you can take a PDF on a memory stick (slightly easier to work wth) or send a pdf to your email. and visiot the store...they have tech's who will help you figure out the best size so you can read the data...I ended up with a 36 by 80 inch poster in color it cost about $5 and looks great.
as a side benefit you can send the PDF file to your relatives and they can go to the local Staples store and get their own copy..saves on mailing...and they can get as amny as they want..